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Palindromic Numbers beyond base 10 Page 1
Page 2 Page 3 Page 4 Sum of First Numbertypes Sequence Products Reversal Products Pythagorean Triples Palindromes in Concatenations Various Palindromic Sums

Palindromic numbers are numbers which read the same from

  left to right (forwards) as from the right to left (backwards)

Here are a few random examples : 7, 3113, 44611644

1. Go directly to the Base 2 to Base 60 Tables topic
2. Go directly to the Base 2 Messages topic

Index Nr Also palindromic in base 2 (binary) A007632 L base 10 L base 2 Next > 10^64 213 9225661674600671492119413057030110307503149112941760064761665229 64 213 212 988826465131293668074348634534515435436843470866392131564628889 63 210 211 963340942546571803566325980966555669089523665308175645249043369 63 210 210 721945861541080831944059331757747757133950449138080145168549127 63 209 209 703733727554683962095752848464595464848257590269386455727337307 63 209 208 523698428896411548968741709857787758907147869845114698824896325 63 209 207 348229779730370552608135519699151996915531806255073037977922843 63 208 206 329119651121996571344794459613737316954497443175699121156911923 63 208 205 149878637428807807609912907455333554709219906708708824736878941 63 207 204 97084207153034624534182757264644646275728143542643035170248079 62 206 203 31179425052552935368317990188033088109971386353925525052497113 62 205 202 11937698107437295349203065987166178956030294359273470189673911 62 203 201 9453665051647828125908449273811183729448095218287461505663549 61 203 200 5770898372378721276419737053374733507379146721278732738980775 61 202 199 5173744016826225201635775186930396815775361025226286104473715 61 202 198 1559189508440973848087403004860684003047808483790448059819551 61 200 197 306758574604027401406795081119911180597604104720406475857603 60 198 196 37548144532934170544701854138283145810744507143923544184573 59 195 195 37314939878297262451001650361916305610015426279287893941373 59 195 194 16684664513200755751031332349594323313015755700231546648661 59 194 193 16248699416440965786466603644344630666468756904461499684261 59 194 192 14865110743603060017033366459395466333071006030634701156841 59 194 191 12975597394288524809767724847974842776790842588249379557921 59 194 190 9526542992481751283981451209119021541893821571842992456259 58 193 189 1698561202464250881399736183223816379931880524642021658961 58 191 188 1319486966107346543235142590660952415323456437016696849131 58 190 187 565566103094990344765405851070158504567443099490301665565 57 189 186 502340045424300390133813486575684318331093003424540043205 57 189 185 172998361891299508580833631575136338085805992198163899271 57 187 184 171265652192757695823295496474694592328596757291256562171 57 187 183 9794258529088310956256765905095676526590138809258524979 55 183 182 7992515739300692681583388637368833851862960039375152997 55 183 181 5982107767230157388234011419141104328837510327677012895 55 182 180 5750352680855632597679040581850409767952365580862530575 55 182 179 5500130929952642025961499398939941695202462599290310055 55 182 178 5375810570128326670426378465648736240766238210750185735 55 182 177 1610250372237506394572456221226542754936057322730520161 55 181 176 141608322140499819558130089980031855918994041223806141 54 177 175 98269568061626490790443471917434409709462616086596289 53 177 174 96974333658798698186600459595400668189689785633347969 53 177 173 74107193679989476350632192529123605367498997639170147 53 176 172 38042682015138742476430662826603467424783151028624083 53 175 171 14290800261309297950160720602706105979290316200809241 53 174 170 11583408501354096073227429192472237069045310580438511 53 173 169 3329456979344803072321377337731232703084439796549233 52 172 168 1894500919149741184783894664983874811479419190054981 52 171 167 1671376559622765380050133113310500835672269556731761 52 171 166 546590550388169569066255343552660965961883055095645 51 169 165 544889901625422417825862090268528714224526109988445 51 169 164 349755095251390482672234414432276284093152590557943 51 168 163 308714513290492817327216515612723718294092315417803 51 168 162 128426799107797312365090999090563213797701997624821 51 167 161 9142687306518774468290258520928644778156037862419 49 163 160 7109242970502610649115178715119460162050792429017 49 163 159 1873893355166996611906735376091166996615533983781 49 161 158 597817365870480462496846648694264084078563718795 48 159 157 502186653128032879493361163394978230821356681205 48 159 156 102735644379963218861031130168812369973446537201 48 157 155 78737696079148631316169196161313684197069673787 47 156 154 74953152103456169263148284136296165430125135947 47 156 153 72830033748815722240681118604222751884733003827 47 156 152 72224512737657344148643434684144375673721542227 47 156 151 56243939994005432191600400619123450049993934265 47 156 150 36755925874534219715185758151791243547852955763 47 155 149 16422159001061376847917371974867316010095122461 47 154 148 12328899531897059171731113717195079813599882321 47 154 147 9335388324586156026843333486206516854238835339 46 153 146 5318935032766104711807997081174016672305398135 46 152 145 903240486809073407096959690704370908684042309 45 150 144 706400325289926993853434358399629982523004607 45 149 143 557019370941199612258585852216991149073910755 45 149 142 9101547767757547725021205277457577677451019 43 143 141 7342779513978827245484845427288793159772437 43 143 140 3381578420704603001613161003064070248751833 43 142 139 1816060344791285708869688075821974430606181 43 141 138 905357630732463833436634338364237036753509 42 140 137 595943598626320807905509708023626895349595 42 139 136 309612431907274418544445814472709134216903 42 138 135 170341815153453197154451791354351518143071 42 137 134 139035351443367699760067996763344153530931 42 137 133 128795669673344381770077183443376966597821 42 137 132 98801466348600079992129997000684366410889 41 137 131 56545858306667087923432978076660385854565 41 136 130 38090421176450233778487733205467112409083 41 135 129 31636759764024794204540249742046795763613 41 135 128 14327425216354951264146215945361252472341 41 134 127 7114907950920173924554293710290597094117 40 133 126 1634587141488515712882175158841417854361 40 131 125 1017421766189445102992015449816671247101 40 130 124 773609618198307097595790703891816906377 39 130 123 551700061998405245575542504899160007155 39 129 122 131674457014330218696812033410754476131 39 127 121 124192421350471300727003174053124291421 39 127 120 122240824002234545959545432200428042221 39 127 119 32190158233101105022050110133285109123 38 125 118 9970387454991896491946981994547830799 37 123 117 9707999142717984907094897172419997079 37 123 116 5893890080115984244424895110800983985 37 123 115 1681824725831390428240931385274281861 37 121 114 1323475457008895965695988007545743231 37 120 113 998021119318189842248981813911120899 36 120 112 794397832642722540045227246238793497 36 120 111 710084230446469950059964644032480017 36 120 110 139124355701640720027046107553421931 36 117 109 96754720977532710701723577902745769 36 117 108 94285848717805140304150871784858249 36 117 107 76759778311938325452383911387795767 36 116 106 54074940541725088788052714504947045 36 116 105 10827628430039640604693003482672801 36 114 104 10652099006552766666725560099025601 36 114 103 9932525402284695775964822045252399 35 113 102 1480869563960100770010693659680841 35 111 101 1409460884147943003497414880649041 35 111 100 579782100975917393719579001287975 34 109 99 332997156422555464555224651799233 33 109 98 188726493036450333054630394627881 33 108 97 7155681676104835384016761865517 31 103 96 3390741646331381831336461470933 31 102 95 1115792035060833380605302975111 31 100 94 378059787464677776464787950873 30 99 93 56532345659072227095654323565 29 96 92 30658464822225352222846485603 29 95 91 30000258151173237115185200003 29 95 90 19756291244127372144219265791 29 94 89 17869806142184248124160896871 29 94 88 1609061098335005338901609061 28 91 87 795280629691202196926082597 27 90 86 552963956270141072659369255 27 89 85 532079161251434152161970235 27 89 84 Prime Curios!    390714505091666190505417093 27 89 83 351095331428353824133590153 27 89 82 138758321383797383123857831 27 87 81 50824513851188115831542805 26 86 80 7475703079870789703075747 25 83 79 7260988688520258868890627 25 83 78 5812988563013103658892185 25 83 77 1219228158701078518229121 25 81 76 1194313761393931673134911 25 80 75 1130486074817184706840311 25 80 74 94261805583838550816249 23 77 73 92913401775957710431929 23 77 72 72928088195859188082927 23 76 71 17461998948684989916471 23 74 70 539475328171823574935 21 69 69 114354126121621453411 21 67 68 94778157422475187749 20 67 67 32889941788714998823 20 65 66 10879740244204797801 20 64 65 9674868723278684769 19 64 64 7036267126217626307 19 63 63 313558153351855313 18 59 62 161206152251602161 18 58 61 55952637073625955 17 56 60 37629927072992673 17 56 59 37078796869787073 17 56 58 34104482028440143 17 55 57 18279440804497281 17 55 56 10819671917691801 17 54 55 10457587478575401 17 54 54 3148955775598413 16 52 53 1793770770773971 16 51 52 933138363831339 15 50 51 552212535212255 15 49 50 34141388314143 14 45 49 9484874784849 13 44 48 Prime Curios!    7284717174827 13 43 47 7227526257227 13 43 46 5652622262565 13 43 45 1999925299991 13 41 44 1794096904971 13 41 43 1792704072971 13 41 42 1474922294741 13 41 41 1413899983141 13 41 40 1234104014321 13 41 39 136525525631 12 37 38 110948849011 12 37 37 75015151057 11 37 36 32479297423 11 35 35 18462126481 11 35 34 10050905001 11 34 33 7451111547 10 33 32 1290880921 10 31 31 939474939 9 30 30 910373019 9 30 29 719848917 9 30 28 13500531 8 24 27 5841485 7 23 26 5259525 7 23 25 5071705 7 23 24 3129213 7 22 23 1979791 7 21 22 1934391 7 21 21 1758571 7 21 20 585585 6 20 19 73737 5 17 18 53835 5 16 17 53235 5 16 16 39993 5 16 15 32223 5 15 14 15351 5 14 13 9009 4 14 12 7447 4 13 11 717 3 10 10 585 3 10 9 Prime Curios!    313 3 9 8 99 2 7 7 33 2 6 6 9 1 4 5 Prime!    7 1 3 4 Prime!    5 1 3 3 Prime!    3 1 2 2 1 1 1 1 0 1 1	Index Nr Also palindromic in base 3 (ternary) A007633 L base 10 L base 3 Next ⩾ D=51 or > 10^50 D 150 8312993012239535645027467647205465359322103992138 49 103 149 7312953677222828045531909091355408282227763592137 49 103 148 6419025021058648449848194918489448468501205209146 49 103 147 5831868009594752801215340435121082574959008681385 49 103 146 4054143930430067149740681860479417600340393414504 49 102 145 4041214683295952053826211126283502595923864121404 49 102 144 1257761522960620942257046407522490260692251677521 49 101 143 926106414507492195751064460157591294705414601629 48 101 142 467135700672249611548285582845116942276007531764 48 100 141 467133988768016052615331133516250610867889331764 48 100 140 254370707068945709669105501966907549860707073452 48 100 139 124458718612960018220428824022810069216817854421 48 99 138 48105236043533460403883138830406433534063250184 47 98 137 42797999695110497707852025870779401159699979724 47 98 136 14920314246455143844691519644834155464241302941 47 97 135 6536178488475825588170660718855285748848716356 46 97 134 1844690584928843839002112009383488294850964481 46 95 133 232634489093028141840242048141820390984436232 45 93 132 231242584463192352743505347253291364485242132 45 93 131 101557391136036949450404054949630631193755101 45 93 130 44290686227997908628266282680979972268609244 44 92 129 8047835340564156054226224506514650435387408 43 90 128 1640035703337228442054502448227333075300461 43 89 127 1003760752370220438064608340220732570673001 43 89 126 806798920165850896315513698058561029897608 42 88 125 404141005277121641711117146121772500141404 42 88 124 88232148482016325069396052361028484123288 41 86 123 86198475285063317412521471336058257489168 41 86 122 84005835019035443348484334453091053850048 41 86 121 61414456229060014394949341006092265441416 41 86 120 46197276142663851754245715836624167279164 41 86 119 23377190559114477125352177441195509177332 41 85 118 22466404849993021927572912039994840466422 41 85 117 3723835261455740052442500475541625383273 40 83 116 3222780971584885372662735884851790872223 40 83 115 865451221400237580979085732004122154568 39 82 114 422258206118029899212998920811602852224 39 81 113 418716360081219105404501912180063617814 39 81 112 396314358479080149353941080974853413693 39 81 111 278778725733056400151004650337527877872 39 81 110 17842906321599943222234999512360924871 38 79 109 4652081067260106987896010627601802564 37 77 108 2999107112484156435346514842117019992 37 77 107 2045497334224684968694864224337945402 37 77 106 580249884396476425524674693488942085 36 75 105 425360399438106370073601834993063524 36 75 104 417993955315996492294699513559399714 36 75 103 258536270793179408804971397072635852 36 75 102 229091051215055957759550512150190922 36 75 101 47096599935251001510015253999569074 35 73 100 24152624449022711611722094442625142 35 73 99 3437305879505466886645059785037343 34 71 98 2171197273742397777932473727911712 34 70 97 700589645299133727331992546985007 33 69 96 599076755164336111633461557670995 33 69 95 8067523603279358539723063257608 31 65 94 6203642540397732377930452463026 31 65 93 5499318374552573752554738139945 31 65 92 4726917974209005009024797196274 31 65 91 2947535375768048408675735357492 31 64 90 2355388672836790976382768835532 31 64 89 2159267986973772773796897629512 31 64 88 2123333325438127218345233333212 31 64 87 1088440733527731377253370448801 31 63 86 582372115009328823900511273285 30 63 85 93265526553267576235562556239 29 61 84 89495329363838483836392359498 29 61 83 40762425457540604575452426704 29 60 82 4249074173260990623714709424 28 58 81 2395752597285555827952575932 28 58 80 2315306525204994025256035132 28 58 79 928575310697090796013575829 27 57 78 428897678921565129876798824 27 56 77 257160526533868335625061752 27 56 76 9642841107132317011482469 25 53 75 2374753005689865003574732 25 52 74 29397375542624557379392 23 48 73 26365450743834705456362 23 47 72 12241986986968968914221 23 47 71 2874264042112404624782 22 45 70 821697400030004796128 21 44 69 671028608646806820176 21 44 68 277444488080884444772 21 43 67 134137835777538731431 21 43 66 125556514464415655521 21 43 65 65691169644696119656 20 42 64 17706590033009560771 20 41 63 6942498569658942496 19 40 62 4054962560652694504 19 40 61 Prime!    3195269530359625913 19 39 60 2746827231327286472 19 39 59 2283864176714683822 19 39 58 659295875578592956 18 38 57 424676146641676424 18 37 56 354164182281461453 18 37 55 248480984489084842 18 37 54 65192854245829156 17 36 53 21669625852696612 17 35 52 21075228182257012 17 35 51 1984267447624891 16 33 50 534174353471435 15 31 49 438222212222834 15 31 48 69490044009496 14 30 47 6852190912586 13 27 46 5972209022795 13 27 45 4978471748794 13 27 44 4657098907564 13 27 43 4320048400234 13 27 42 2121010101212 13 26 41 81234543218 11 23 40 58049094085 11 23 39 2518338152 10 20 38 885626588 9 19 37 520080025 9 19 36 387505783 9 19 35 239060932 9 18 34 211131112 9 18 33 123464321 9 17 32 Prime!    112969211 9 17 31 83155138 8 17 30 27711772 8 16 29 Prime!    7949497 7 15 28 7875787 7 15 27 5737375 7 15 26 4287824 7 14 25 4251524 7 14 24 4219124 7 14 23 4022204 7 14 22 2985892 7 14 21 1521251 7 13 20 848848 6 13 19 Prime!    93739 5 11 18 92929 5 11 17 76267 5 11 16 75457 5 11 15 74647 5 11 14 48884 5 10 13 29092 5 10 12 Prime!    757 3 7 11 656 3 6 10 484 3 6 9 242 3 5 8 212 3 5 7 Prime!    151 3 5 6 121 3 5 5 8 1 2 4 4 1 2 3 Prime!    2 1 1 2 1 1 1 1 0 1 1
Index Nr Also palindromic in base 4 A029961 L base 10 L base 4 Next > 10^40 121 9898698231252698794334978962521328968989 40 67 120 5169043619890360597117950630989163409615 40 66 119 685112683421306610727016603124386211586 39 65 118 589444851317301925878529103713158444985 39 65 117 560317633455182698747896281554336713065 39 65 116 545998783344246716373617642443387899545 39 65 115 397540572598251145040541152895275045793 39 65 114 353043409157494433363334494751904340353 39 65 113 31666051446996584499448569964415066613 38 63 112 5121648899337220344430227339988461215 37 61 111 2690886340179150903090519710436880962 37 61 110 2677760918033412057502143308190677762 37 61 109 520420568497729466664927794865024025 36 60 108 328546932213864537735468312239645823 36 59 107 300157542046102980089201640245751003 36 59 106 147712308905035486684530509803217741 36 59 105 92569811594494975757949449511896529 35 59 104 92105437371286169496168217373450129 35 59 103 19089684997805246464250879948698091 35 57 102 17881864361422979197922416346818871 35 57 101 7179388640860660330660680468839717 34 57 100 5108871198905577557755098911788015 34 56 99 994887846928401212104829648788499 33 55 98 831689027065710434017560720986138 33 55 97 681970163682115333511286361079186 33 55 96 649436972861202060202168279634946 33 55 95 582281078505704363407505870182285 33 55 94 562496915896771070177698519694265 33 55 93 372432716388987767789883617234273 33 55 92 60036324544335099053344542363006 32 53 91 31197674993704500540739947679113 32 53 90 5435741640249592959420461475345 31 52 89 1875014103448187818443014105781 31 51 88 1871235782426682866242875321781 31 51 87 1816218002915034305192008126181 31 51 86 1276212763129075709213672126721 31 51 85 545349408734694496437804943545 30 50 84 92792216149502820594161229729 29 49 83 15821048498880208889484012851 29 47 82 7778107491576446751947018777 28 47 81 666101379010252010973101666 27 45 80 541144382839404938283441145 27 45 79 353061698367474763896160353 27 45 78 336725943608707806349527633 27 45 77 35852144650688605644125853 26 43 76 5667740260737370620477665 25 42 75 5644977785034305877794465 25 42 74 5205366624977794266635025 25 42 73 5072939121521251219392705 25 42 72 1622633305817185033362261 25 41 71 224769553250052355967422 24 39 70 149265574723327475562941 24 39 69 109895081241142180598901 24 39 68 98996197452425479169989 23 39 67 59923211850205811232995 23 38 66 59737594200100249573795 23 38 65 57410264882528846201475 23 38 64 874218768525867812478 21 35 63 830935451626154539038 21 35 62 819177862404268771918 21 35 61 542737478606874737245 21 35 60 371765223161322567173 21 35 59 317920613282316029713 21 35 58 43982928355382928934 20 33 57 41378114300341187314 20 33 56 5808197420247918085 19 32 55 5452702834382072545 19 32 54 3896203035303026983 19 31 53 3614621407041264163 19 31 52 3610232617162320163 19 31 51 Prime!    1270237235327320721 19 31 50 101882796697288101 18 29 49 96062045454026069 17 29 48 57264776467746275 17 28 47 55934950005943955 17 28 46 13585963536958531 17 27 45 7145572222755417 16 27 44 912702454207219 15 25 43 815969141969518 15 25 42 646219242912646 15 25 41 41830077003814 14 23 40 5690277720965 13 22 39 3445416145443 13 21 38 1649061609461 13 21 37 1491278721941 13 21 36 508152251805 12 20 35 506802208605 12 20 34 Prime!    73979697937 11 19 33 59201610295 11 18 32 53406060435 11 18 31 51717171715 11 18 30 954656459 9 15 29 623010326 9 15 28 53822835 8 13 27 5679765 7 12 26 5614165 7 12 25 5297925 7 12 24 5259525 7 12 23 5226225 7 12 22 5051505 7 12 21 3866683 7 11 20 Prime!    3826283 7 11 19 2215122 7 11 18 1801081 7 11 17 506605 6 10 16 57675 5 8 15 55655 5 8 14 55255 5 8 13 53235 5 8 12 7997 4 7 11 939 3 5 10 Prime!    787 3 5 9 666 3 5 8 393 3 5 7 Prime!    373 3 5 6 55 2 3 5 Prime!    5 1 2 4 Prime!    3 1 1 3 Prime!    2 1 1 2 1 1 1 1 0 1 1	Index Nr Also palindromic in base 5 A029962 L base 10 L base 5 Next > [277] 277 7087000700149972587664069383138060995335990608313839604667852799410070007807 76 109 276 671053428872854664263225476420495938101839594024674522362466458278824350176 75 108 275 281801993396381244536102471667766282646282667766174201635442183693399108182 75 107 274 281364725118555743510108058258553881797188355852850801015347555811527463182 75 107 273 281364720168846252709813683657118614707416811756386318907252648861027463182 75 107 272 256340321174660007408110210085955313757313559580012011804700066471123043652 75 107 271 198893305927179817239226618048947699141996749840816622932718971729503398891 75 107 270 198848753847424241245482931604243010474010342406139284542142424748357848891 75 107 269 80881314089065862301444978286120102111120102168287944410326856098041318808 74 106 268 80439652204933368124208731195343923355332934359113780242186333940225693408 74 106 267 6503537191954886401321566503193976544456793913056651231046884591917353056 73 105 266 6503031671994653903280431357542088877788802457531340823093564991761303056 73 105 265 6004540549597190115050022552041959612169591402552200505110917959450454006 73 105 264 4329517102173361227292126671147145566655417411766212927221633712017159234 73 104 263 4324596596701984791115735131438849112119488341315375111974891076956954234 73 104 262 4079575356285491152079850105241963806083691425010589702511945826535759704 73 104 261 4079575351524930335376797647399700938390079937467976735330394251535759704 73 104 260 4038696330387775753588062380375196644466915730832608853575777830336968304 73 104 259 2770437611442804917175468586230810508050180326858645717194082441167340772 73 104 258 2047699112840810756924555926988846932396488896295554296570180482119967402 73 104 257 2001786025029011492911485875154110736370114515785841192941109205206871002 73 104 256 66164436814111770049876762344228203230282244326767894007711141863446166 71 102 255 66111764518548786344605034003243775357734230043050644368784581546711166 71 102 254 66111298184454878278484201159462513831526495110248487287845448189211166 71 102 253 22805430260312585299581824832894951315949823842818599258521306203450822 71 101 252 22800166075825108900823721681776320902367718612732800980152857066100822 71 101 251 22440437430634254371053281478474271217247487418235017345243603473404422 71 101 250 11828258938202959786888244145350424042405354144288868795920283985282811 71 101 249 11822344114158947771316871691877312121377819617861317774985141144322811 71 101 248 11052527414478866949183917241936358785363914271938194966887441472525011 71 101 247 11052010245860911477473868383105243634250138386837477411906854201025011 71 101 246 782484421036123656818882872707346070643707278288818656321630124484287 69 99 245 705596089315638933492195332403344141443304233591294339836513980695507 69 99 244 705544784344049835688518391467080696080764193815886538940443487445507 69 99 243 705544732707068685125001366851145989541158663100521586860707237445507 69 99 242 705064193530321996556056559198835323538891955650655699123035391460507 69 99 241 8861183495570775709864866443058205028503446684689075770755943811688 67 96 240 8530182234365262593933805530194751574910355083393952625634322810358 67 96 239 650791670217516566242012790848259952848097210242665615712076197056 66 95 238 463249636005696782424586302355227722553203685424287696500636942364 66 94 237 209994648774379125533802074177124421771470208335521973477846499902 66 94 236 209991881656858082229108566985426624589665801922280858656188199902 66 94 235 99543624930708890704741862774786868747726814740709880703942634599 65 93 234 99147784312541604654976982616872327861628967945640614521348774199 65 93 233 6328602704926148022920974990772442770994790292208416294072068236 64 92 232 3214064425866839870550144501476006741054410550789386685244604123 64 91 231 1194298706261022647836038501203773021058306387462201626078924911 64 91 230 64246994130107791610563653101711710135636501619770103149964246 62 89 229 64246947151782073152069988044044044088996025137028715174964246 62 89 228 6726055113244810012075917310121210137195702100184423115506276 61 88 227 1537290958777611519852104788359538874012589151167778590927351 61 87 226 1532805993046939711317225597922297955227131179396403995082351 61 87 225 883356191198880777154229788401104887922451777088891191653388 60 86 224 855387148635738589348806089598895980608843985837536841783558 60 86 223 65611982177205547205464612752725721646450274550277128911656 59 85 222 49066470901871197820861535773837753516802879117810907466094 59 84 221 46564717781637429651286018560906581068215692473618771746564 59 84 220 46193204666936421034725056580608565052743012463966640239164 59 84 219 26819889378948503897349399266566299394379830584987398891862 59 84 218 26819327009787305648386096848684869068384650378790072391862 59 84 217 26429470394241104810070078034443087007001840114249307492462 59 84 216 23505993486869791222414191577177519141422219796868439950532 59 84 215 23505101759336115455443641282328214634455451163395710150532 59 84 214 23110716142491983043006607134643170660034038919424161701132 59 84 213 9939319018903649287536637142992417366357829463098109139399 58 83 212 9663532981431429183577455753113575547753819241341892353669 58 83 211 323992966009823764929890740888047098929467328900669299323 57 81 210 147607387738648286008522726555627225800682846837783706741 57 81 209 147479499604608433501150032393230051105334806406994974741 57 81 208 143388662988323740825383628646826383528047323889266883341 57 81 207 143321023950291019441762870959078267144910192059320123341 57 81 206 119863297658330074654226108000801622456470033856792368911 57 81 205 119628570830560390462705268656862507264093065038075826911 57 81 204 Prime!    7278175677249196711781595411145951871176919427765718727 55 79 203 7273374492984432327579333256523339757232344892944733727 55 79 202 7222664231853227887310973231323790137887223581324662227 55 79 201 6432766862954931730863303210123033680371394592686672346 55 79 200 85716526225965980181166063136066118108956952262561758 53 76 199 85716017941173123289734017871043798232137114971061758 53 76 198 85716017477430276081758313031385718067203477471061758 53 76 197 82804167487745127987827179797172878972154778476140828 53 76 196 4677402018132779160228780990878220619772318102047764 52 74 195 842273089643651424746389343983647424156346980372248 51 73 194 842273084433104837434610484016434738401334480372248 51 73 193 842226914944632453620370868073026354236449419622248 51 73 192 14866415178804123258016455461085232140887151466841 50 71 191 14453303304094582613377100177331628549040330335441 50 71 190 649936241751591323106805508601323195157142639946 48 69 189 644863400626259088360013310063880952626004368446 48 69 188 18946467978107252552707370725525270187976464981 47 67 187 18443384607066153566982628966535166070648334481 47 67 186 15431793058951766720187878102766715985039713451 47 67 185 15088344815041421175663836657112414051844388051 47 67 184 15083888608839064281812521818246093880688838051 47 67 183 628697035925578552616888616255875529530796826 45 65 182 623253838747288310488898884013882747838352326 45 65 181 623206113631461755935454539557164136311602326 45 65 180 453749841231167144063656360441761132148947354 45 64 179 453511538505603587495626594785306505835115354 45 64 178 299610806696519408825434528804915696608016992 45 64 177 299610383727266016934646439610662727383016992 45 64 176 295964701807089636010787010636980708107469592 45 64 175 295282435673135443681676186344531376534282592 45 64 174 266201850128363317817101718713363821058102662 45 64 173 98966828061040971279788797217904016082866989 44 63 172 98912606618485761310633601316758481660621989 44 63 171 84086672007102503839977993830520170027668048 44 63 170 81240685713569129553899835592196531758604218 44 63 169 6011032286710901481210121841090176822301106 43 62 168 4277593255207257584473744857527025523957724 43 61 167 4270026508536613602272722063166358056200724 43 61 166 4236754831325615292754572925165231384576324 43 61 165 4236708500824894032575752304984280058076324 43 61 164 2426494758641569264741474629651468574946242 43 61 163 2426494706658461989505059891648566074946242 43 61 162 2181439476143709144546454419073416749341812 43 61 161 2147108966833950371150511730593386698017412 43 61 160 2106935294299775474599954745779924925396012 43 61 159 2106902281191302045590955402031911822096012 43 61 158 1416696065500088921662661298800055606966141 43 61 157 1414883972971911767319137671191792793884141 43 61 156 1010331096582278428458548248722856901330101 43 61 155 64515508991444322135253122344419980551546 41 59 154 61153138639139701434943410793193683135116 41 59 153 879878999661878204161402878166999878978 39 56 152 879348262202819129818921918202262843978 39 56 151 45958282654026060755706062045628285954 38 54 150 9835554837464633869683364647384555389 37 53 149 9596045768849458689868549488675406959 37 53 148 9505227132110846796976480112317225059 37 53 147 8467638770573174655564713750778367648 37 53 146 8183225575843802043402083485755223818 37 53 145 8145978316763435541455343676138795418 37 53 144 8140197799388539232329358839977910418 37 53 143 685120603841801367763108148306021586 36 52 142 602117076566221263362122665670711206 36 52 141 215355547165064584485460561745553512 36 51 140 106007162214551780087155412261700601 36 51 139 7748092041062101661012601402908477 34 49 138 6950267776950891441980596777620596 34 49 137 186838521546391111193645125838681 33 47 136 186162880909630434036909088261681 33 47 135 186162396111968171869111693261681 33 47 134 159171014284036444630482410171951 33 47 133 151998543003841676148300345899151 33 47 132 151998059721974171479127950899151 33 47 131 87653343665645377354656634335678 32 46 130 6297024459737003007379544207926 31 45 129 6292788805324353534235088872926 31 45 128 4572400421665334335661240042754 31 44 127 920049038842450054248830940029 30 43 126 863908970332451154233079809368 30 43 125 68123866829364346392866832186 29 42 124 60795457035659595653075459706 29 42 123 41618751128915351982115781614 29 41 122 31891884714945654941748819813 29 41 121 31417977787079697078777971413 29 41 120 31417972547345054374527971413 29 41 119 31416063242381218324236061413 29 41 118 31098164866494349466846189013 29 41 117 31029154725081318052745192013 29 41 116 24055999711386268311799955042 29 41 115 14626535770963836907753562641 29 41 114 10644461464435453446416444601 29 41 113 10233317539812221893571333201 29 41 112 775981910664202466019189577 27 39 111 775939410541000145014939577 27 39 110 775934282861868168282439577 27 39 109 691774458431323134854477196 27 39 108 618762750915151519057267816 27 39 107 613119004633151336400911316 27 39 106 18652160016866861006125681 26 37 105 15636166151988915166163651 26 37 104 15631144307799770344113651 26 37 103 8785720289021209820275878 25 36 102 679116049774477940611976 24 35 101 89750520757375702505798 23 33 100 89750054183338145005798 23 33 99 89707442492029424470798 23 33 98 89378795951815959787398 23 33 97 89373703300800330737398 23 33 96 89373235305150353237398 23 33 95 86985339391719393358968 23 33 94 86980677074747077608968 23 33 93 86502759048484095720568 23 33 92 86502714378987341720568 23 33 91 83732343311311334323738 23 33 90 83208975695159657980238 23 33 89 83208405647274650480238 23 33 88 4185459800880089545814 22 31 87 3441731791881971371443 22 31 86 2015496835005386945102 22 31 85 1073077634334367703701 22 31 84 1071727595775957271701 22 31 83 69258642177124685296 20 29 82 66819814955941891866 20 29 81 61034375000057343016 20 29 80 22192753388335729122 20 28 79 1877026246426207781 19 27 78 1872666725276662781 19 27 77 1872168528258612781 19 27 76 1560890621260980651 19 27 75 1560393839383930651 19 27 74 1527447408047447251 19 27 73 67546323432364576 17 25 72 62596751915769526 17 25 71 28453146364135482 17 24 70 28012639493621082 17 24 69 25856101110165852 17 24 68 25851377577315852 17 24 67 8671162112611768 16 23 66 8066449229446608 16 23 65 8061113993111608 16 23 64 658768979867856 15 22 63 653311040113356 15 22 62 473696969696374 15 21 61 473643646346374 15 21 60 449933929339944 15 21 59 449488282884944 15 21 58 445389595983544 15 21 57 445384969483544 15 21 56 445336272633544 15 21 55 378573424375873 15 21 54 374476969674473 15 21 53 301537434735103 15 21 52 279119383911972 15 21 51 206903565309602 15 21 50 206725444527602 15 21 49 202304515403202 15 21 48 176265757562671 15 21 47 176071838170671 15 21 46 172849181948271 15 21 45 172102080201271 15 21 44 132412434214231 15 21 43 107793080397701 15 21 42 107745787547701 15 21 41 103824717428301 15 21 40 103191131191301 15 21 39 7730173710377 13 19 38 6989062609896 13 19 37 6982578752896 13 19 36 6694978794966 13 19 35 6648130318466 13 19 34 6643369633466 13 19 33 6105769675016 13 19 32 2228261628222 13 18 31 12185058121 11 15 30 12114741121 11 15 29 6761551676 10 15 28 2893553982 10 14 27 2596886952 10 14 26 2512882152 10 14 25 836181638 9 13 24 836131638 9 13 23 831868138 9 13 22 831333138 9 13 21 808656808 9 13 20 65977956 8 12 19 47633674 8 11 18 30322303 8 11 17 27711772 8 11 16 10400401 8 11 15 10088001 8 11 14 18881 5 7 13 15751 5 7 12 1221 4 5 11 676 3 5 10 626 3 5 9 282 3 4 8 252 3 4 7 88 2 3 6 6 1 2 5 4 1 1 4 Prime!    3 1 1 3 Prime!    2 1 1 2 1 1 1 1 0 1 1
Index Nr Also palindromic in base 6 A029963 L base 10 L base 6 Next > 10^40 182 3185673581334201439889341024331853765813 40 51 181 928181092759579220999022975957290181829 39 51 180 777265347213910266737662019312743562777 39 50 179 296655284171680822888228086171482556692 39 50 178 142394478441604021737120406144874493241 39 50 177 119311750343636613848316636343057113911 39 49 176 73251070906945220733702254960907015237 38 49 175 62402446945301750055005710354964420426 38 49 174 33203243367032779377397723076334230233 38 49 173 14635219237114228411482241173291253641 38 48 172 5925388848372266868686622738488835295 37 48 171 5460943193028108855588018203913490645 37 48 170 3559721027548347379737438457201279553 37 47 169 3259005217549963284823699457125009523 37 47 168 2976063758545757802087575458573606792 37 47 167 2864064793774801970791084773974604682 37 47 166 2791357264246966698966696424627531972 37 47 165 2613028432718594701074958172348203162 37 47 164 2611931073766037707077306673701391162 37 47 163 1042768194141956284826591414918672401 37 47 162 91366602358960087678006985320666319 35 45 161 85850514786478824742887468741505858 35 45 160 44116500862538720402783526800561144 35 45 159 41380151725216155855161252715108314 35 45 158 16506910433917802720871933401960561 35 44 157 913515200683346333643386002515319 33 43 156 576542373740893878398047373245675 33 43 155 317153912996727303727699219351713 33 42 154 304767308284253767352482803767403 33 42 153 158283295307421010124703592382851 33 42 152 132112185378440333044873581211231 33 42 151 95325858871299622699217885852359 32 42 150 60899387248280999908284278399806 32 41 149 4835402039491789871949302045384 31 40 148 1947310024641662661464200137491 31 39 147 1888272568387519157838652728881 31 39 146 1219249404745462645474049429121 31 39 145 1142260953297925297923590622411 31 39 144 845174472725767767527274471548 30 39 143 253101592885187781588295101352 30 38 142 99136807204618881640270863199 29 38 141 90534925574183938147552943509 29 38 140 58662498903736363730989426685 29 37 139 53430130575844644857503103435 29 37 138 46197179839975857993897179164 29 37 137 44977031429075957092413077944 29 37 136 33564674825302120352847646533 29 37 135 33170816709001710090761807133 29 37 134 19414820149080108094102841491 29 37 133 14058942864120402146824985041 29 37 132 10420401206163436160210402401 29 37 131 8522383718294004928173832258 28 36 130 1470462462886336882642640741 28 35 129 686825231026969620132528686 27 35 128 570278675846909648576872075 27 35 127 187626632257040752236626781 27 34 126 71623652730500503725632617 26 34 125 30094322625633652622349003 26 33 124 9961115200190910025111699 25 33 123 2674167082268622807614762 25 32 122 1452832845293925482382541 25 32 121 1174831508694968051384711 25 31 120 1174355118788878115534711 25 31 119 114779971077770179977411 24 30 118 Prime!    36599233807670833299563 23 29 117 33461025859695852016433 23 29 116 32046696937973969664023 23 29 115 31442983675957638924413 23 29 114 27596928275057282969572 23 29 113 26387697060106079678362 23 29 112 4800062971441792600084 22 28 111 3951300420330240031593 22 28 110 3228607293993927068223 22 28 109 954705277777772507459 21 27 108 698624223676322426896 21 27 107 515942802363208249515 21 27 106 413110328121823011314 21 27 105 184042927656729240481 21 27 104 101486113646311684101 21 26 103 80695452588525459608 20 26 102 5761547475747451675 19 25 101 5283511046401153825 19 25 100 617599427724995716 18 23 99 76123829292832167 17 22 98 65332462626423356 17 22 97 63799978687999736 17 22 96 34283490709438243 17 22 95 14459868686895441 17 21 94 14441050405014441 17 21 93 12907568886570921 17 21 92 8020863443680208 16 21 91 5796663883666975 16 21 90 2806592662956082 16 20 89 900893585398009 15 20 88 596437282734695 15 19 87 585789323987585 15 19 86 521151929151125 15 19 85 480680444086084 15 19 84 422383797383224 15 19 83 395921848129593 15 19 82 389019363910983 15 19 81 359630212036953 15 19 80 309491626194903 15 19 79 285666464666582 15 19 78 Prime!    155259838952551 15 19 77 80839044093808 14 18 76 51910622601915 14 18 75 41443999934414 14 18 74 10268799786201 14 17 73 9766560656679 13 17 72 8288882888828 13 17 71 6873812183786 13 17 70 3695202025963 13 17 69 3693222223963 13 17 68 3691422241963 13 17 67 3666926296663 13 17 66 1808482848081 13 16 65 75535653557 11 14 64 71771717717 11 14 63 61662426616 11 14 62 18013531081 11 14 61 12482428421 11 13 60 Prime!    11271517211 11 13 59 8801331088 10 13 58 7786556877 10 13 57 7111881117 10 13 56 4368778634 10 13 55 3733113373 10 13 54 342050243 9 11 53 310393013 9 11 52 290222092 9 11 51 Prime!    108151801 9 11 50 104888401 9 11 49 103656301 9 11 48 24466442 8 10 47 15266251 8 10 46 9081809 7 9 45 8164618 7 9 44 6983896 7 9 43 6934396 7 9 42 6901096 7 9 41 5799975 7 9 40 5766675 7 9 39 5733375 7 9 38 5482845 7 9 37 5433345 7 9 36 5400045 7 9 35 5182815 7 9 34 5100015 7 9 33 4849484 7 9 32 4598954 7 9 31 4565654 7 9 30 4516154 7 9 29 4298924 7 9 28 4265624 7 9 27 4232324 7 9 26 3097903 7 9 25 1867681 7 9 24 909909 6 8 23 808808 6 8 22 168861 6 7 21 74647 5 7 20 39893 5 6 19 22022 5 6 18 7777 4 6 17 7667 4 5 16 1441 4 5 15 868 3 4 14 777 3 4 13 434 3 4 12 343 3 4 11 Prime!    191 3 3 10 141 3 3 9 111 3 3 8 55 2 3 7 Prime!    7 1 2 6 Prime!    5 1 1 5 4 1 1 4 Prime!    3 1 1 3 Prime!    2 1 1 2 1 1 1 1 0 1 1	Index Nr Also palindromic in base 7 A029964 L base 10 L base 7 Next > 10^40 128 4126688106932217269779627122396018866214 40 47 127 4121306717355044943333494405537176031214 40 47 126 1728690838987770333333330777898380968271 40 47 125 679757964649133972898279331946469757976 39 46 124 483499184935668824828428866539481994384 39 46 123 460284229046006476353674600640922482064 39 46 122 253298422160386385313583683061224892352 39 46 121 86627108937077803333330877073980172668 38 45 120 8463235419549075666665709459145323648 37 44 119 8299518903567967541457697653098159928 37 44 118 2783173010412928432348292140103713872 37 44 117 2139321471593244640464423951741239312 37 43 116 1323649201011541183811451101029463231 37 43 115 796600400078841230032148870004006697 36 43 114 30223222779139719291793197722232203 35 41 113 26681561096920319891302969016518662 35 41 112 22942937489082426662428098473924922 35 41 111 22068491802826777077762820819486022 35 41 110 2309361801544991551994451081639032 34 40 109 844814580034797141797430085418448 33 39 108 822875672474102111201474276578228 33 39 107 623212664974818070818479466212326 33 39 106 604720044699648787846996440027406 33 39 105 524156803248140767041842308651425 33 39 104 174261150189148171841981051162471 33 39 103 9298526975444340434445796258929 31 37 102 8259671255492185812945521769528 31 37 101 8047593350319629269130533957408 31 37 100 4485766253661756571663526675844 31 37 99 3167213390881820281880933127613 31 37 98 3049355598887082807888955539403 31 37 97 2599448724820942490284278449952 31 36 96 827265019352763367253910562728 30 36 95 485858455181208802181554858584 30 36 94 Prime!    96623707604964146940670732669 29 35 93 84392654427918281972445629348 29 35 92 75260943181419691418134906257 29 35 91 2536157013701331073107516352 28 33 90 654661601646222646106166456 27 32 89 122502700179707971007205221 27 31 88 Prime!    120852845282999282548258021 27 31 87 108247294917808719492742801 27 31 86 99669755826033062855796699 26 31 85 70204945056655665054940207 26 31 84 3025606571400041756065203 25 29 83 2696553435692965343556962 25 29 82 799511729750057927115997 24 29 81 67949117406960471194976 23 28 80 65437371449594417373456 23 27 79 47019576850605867591074 23 27 78 29627836901610963872692 23 27 77 24392712895759821729342 23 27 76 20722521562726512522702 23 27 75 Prime!    17797767519791576779771 23 27 74 8421198978888798911248 22 26 73 942538532686235835249 21 25 72 755667017939710766557 21 25 71 617161162878261161716 21 25 70 507598924909429895705 21 25 69 400003717000717300004 21 25 68 397793140060041397793 21 25 67 240176399252993671042 21 25 66 22244818422481844222 20 23 65 9100681853581860019 19 23 64 7869047624267409687 19 23 63 99739047074093799 17 21 62 98709855955890789 17 21 61 67122911011922176 17 20 60 65045053335054056 17 20 59 42074205350247024 17 20 58 7584718778174857 16 19 57 3179862222689713 16 19 56 229716363617922 15 17 55 215821424128512 15 17 54 208063959360802 15 17 53 201946010649102 15 17 52 85161755716158 14 17 51 74194966949147 14 17 50 49929477492994 14 17 49 23419766791432 14 16 48 8868067608688 13 16 47 6750989890576 13 16 46 4158563658514 13 15 45 2928299928292 13 15 44 2745382835472 13 15 43 2680120210862 13 154 42 2451956591542 13 15 41 2264092904622 13 15 40 1269880889621 13 15 39 775350053577 12 15 38 426970079624 12 14 37 95365056359 11 13 36 91023932019 11 13 35 Prime!    90750705709 11 13 34 75431213457 11 13 33 75016161057 11 13 32 65796069756 11 13 31 64454545446 11 13 30 61454945416 11 13 29 45862226854 11 13 28 40130703104 11 13 27 25699499652 11 13 26 858474858 9 11 25 657494756 9 11 24 638828836 9 11 23 485494584 9 11 22 466828664 9 11 21 230474032 9 10 20 61255216 8 10 19 Prime!    9470749 7 9 18 6958596 7 9 17 6597956 7 9 16 4602064 7 8 15 2137312 7 8 14 65656 5 6 13 Prime!    16561 5 5 12 292 3 3 11 242 3 3 10 171 3 3 9 121 3 3 8 8 1 2 7 6 1 1 6 Prime!    5 1 1 5 4 1 1 4 Prime!    3 1 1 3 Prime!    2 1 1 2 1 1 1 1 0 1 1
Index Nr Also palindromic in base 8 (octal) A029804 L base 10 L base 8 Next > 10^40 151 9044978363553842766776672483553638794409 40 45 150 504944832285682819464918286582238449405 39 43 149 16733873708124592500529542180737833761 38 42 148 9380639871862278054508722681789360839 37 41 147 8325812618327428740478247238162185238 37 41 146 8303598457991125694965211997548953038 37 41 145 7518108788447828631368287448878018157 37 41 144 7305747986252294597954922526897475037 37 41 143 7135547701065363210123635601077455317 37 41 142 6388516661684423292923244861666158836 37 41 141 6305028076164777301037774616708205036 37 41 140 5137013863540021396931200453683107315 37 41 139 1422691232582749366639472852321962241 37 41 138 597185634034507050050705430436581795 36 40 137 453392953902277425524772209359293354 36 40 136 60797710947870157175107874901779706 35 39 135 49706532694260217771206249623560794 35 39 134 43846638839560254845206593883664834 35 39 133 39706221387868234743286878312260793 35 39 132 14362224099067427872476099042226341 35 38 131 6091280052696093663906962500821906 34 38 130 1141897415190856226580915147981411 34 37 129 994090604572440313044275406090499 33 37 128 858037680965763515367569086730858 33 37 127 835523283332531656135233382325538 33 37 126 587617843046963898369640348716785 33 37 125 564341093237119818911732390143465 33 37 124 355309407484416525614484704903553 33 37 123 89879768957194388349175986797898 32 36 122 38525491344366033066344319452583 32 35 121 17181377425940999904952477318171 32 35 120 3792033197162477742617913302973 31 34 119 3377242440477033307740442427733 31 34 118 2903795477478606068747745973092 31 34 117 1949700108422995992248010079491 31 34 116 98444861536975557963516844489 29 33 115 79443858725719191752785834497 29 33 114 68607705200272427200250770686 29 32 113 62119978192296969229187991126 29 32 112 36386515691205650219651568363 29 32 111 20466353976385158367935366402 29 32 110 2674972302079669702032794762 28 31 109 619057787673525376787750916 27 30 108 138668092301868103290866831 27 29 107 107184009820444028900481701 27 29 106 82268662917644671926686228 26 29 105 41155431112055021113455114 26 29 104 9504411213036303121144059 25 28 103 9502917646378736467192059 25 28 102 9500465760922290675640059 25 28 101 6857776528536358256777586 25 28 100 3760849013081803109480673 25 28 99 2091103570615160753011902 25 27 98 1646819988303038899186461 25 27 97 890170268088880862071098 24 27 96 315610027864468720016513 24 27 95 39752656623032665625793 23 26 94 36258340143534104385263 23 25 93 Prime!    34125703495359430752143 23 25 92 17395259698289695259371 23 25 91 15863125024242052136851 23 25 90 7393237064774607323937 22 25 89 2503498805115088943052 22 24 88 579927810111018729975 21 23 87 556362998454899263655 21 23 86 552868393727393868255 21 23 85 494635531909135536494 21 23 84 473317002010200713374 21 23 83 379080765242567080973 21 23 82 375586160515061685573 21 23 81 375183597404795381573 21 23 80 371911868919868119173 21 23 79 202693712161217396202 21 23 78 77580854944945808577 20 23 77 44643103022030134644 20 22 76 32300361188116300323 20 22 75 9843207767677023489 19 22 74 3800003150513000083 19 21 73 3676077166617706763 19 21 72 2650626939396260562 19 21 71 2445420079700245442 19 21 70 1219071169611709121 19 21 69 136053358853350631 18 19 68 105080469964080501 18 19 67 96876827472867869 17 19 66 84199148484199148 17 19 65 84172361516327148 17 19 64 70333341514333307 17 19 63 57234017271043275 17 19 62 45576210301267554 17 19 61 45534430503443554 17 19 60 33239024742093233 17 19 59 685854414458586 15 17 58 683113474311386 15 17 57 666551535155666 15 17 56 393073414370393 15 17 55 359934111439953 15 17 54 224785646587422 15 16 53 185850999058581 15 16 52 112745383547211 15 16 51 34926999962943 14 15 50 28719555591782 14 15 49 13994688649931 14 15 48 7712150512177 13 15 47 5853143413585 13 15 46 5227529257225 13 15 45 390894498093 12 13 44 294378873492 12 13 43 94466666449 11 13 42 94029892049 11 13 41 20855555802 11 12 40 4637337364 10 11 39 4480880844 10 11 38 4424994244 10 11 37 2464554642 10 11 36 1820330281 10 11 35 799535997 9 10 34 719848917 9 10 33 532898235 9 10 32 130535031 9 9 31 55366355 8 9 30 4198914 7 8 29 Prime!    1970791 7 7 28 1935391 7 7 27 Prime!    1496941 7 7 26 660066 6 7 25 628826 6 7 24 207702 6 6 23 30303 5 5 22 Prime!    30103 5 5 21 26662 5 5 20 26462 5 5 19 Prime!    13331 5 5 18 13131 5 5 17 8778 4 5 16 3663 4 4 15 585 3 4 14 414 3 3 13 Prime!    373 3 3 12 333 3 3 11 292 3 3 10 121 3 3 9 9 1 2 8 Prime!    7 1 1 7 6 1 1 6 Prime!    5 1 1 5 4 1 1 4 Prime!    3 1 1 3 Prime!    2 1 1 2 1 1 1 1 0 1 1	Index Nr Also palindromic in base 9 A029965 L base 10 L base 9 Next > 10^40 125 925796349777454027838720454777943697529 39 41 124 802903026932624480454084426239620309208 39 41 123 680508732690186647111746681096237805086 39 41 122 674410576390272565494565272093675014476 39 41 121 661338700284357153787351753482007833166 39 41 120 609771222072561512333215165270222177906 39 41 119 605870895549421979717979124945598078506 39 41 118 514951795147257373040373752741597159415 39 41 117 480161099334140484666484041433990161084 39 41 116 342622577390750793101397057093775226243 39 41 115 Prime!    314419338131817706717607718131833914413 39 41 114 289356952839973468383864379938259653982 39 41 113 229478811206487674666476784602118874922 39 41 112 218733238157937964626469739751832337812 39 41 111 201049358475715389919983517574853940102 39 41 110 199365545055136657515756631550545563991 39 41 109 7802493952565656092906565652593942087 37 39 108 7131665271275119844489115721725661317 37 39 107 6022188419598848703078488959148812206 37 39 106 3144735134269112448442119624315374413 37 39 105 140874769510082121121280015967478041 36 37 104 87452898124430586668503442189825478 35 37 103 63434953707685603630658670735943436 35 37 102 52164240456450245154205465404246125 35 37 101 906581609446746141647644906185609 33 35 100 855416331925080666080529133614558 33 35 99 850846048350427181724053840648058 33 35 98 705957434647084414480746434759507 33 35 97 655328542632671808176236245823556 33 35 96 512970816946935616539649618079215 33 35 95 511785965847272252272748569587115 33 35 94 491879003463276565672364300978194 33 35 93 339265041703202717202307140562933 33 35 92 18329411320009277290002311492381 32 33 91 7904754738784009004878374574097 31 33 90 4277045785240515150425875407724 31 33 89 367466851818670076818158664763 30 31 88 215948807714500005417708849512 30 31 87 128703552485892298584255307821 30 31 86 67440113111063636011131104476 29 31 85 60796365448509190584456369706 29 31 84 875418005018060810500814578 27 29 83 656832269289292982962238656 27 29 82 648954603969313969306459846 27 29 81 31685502993055039920558613 26 27 80 26880855807266270855808862 26 27 79 684706509850058905607486 24 25 78 669604182115511281406966 24 25 77 594042901604406109240495 24 25 76 175443770998899077344571 24 25 75 7623722153663512273267 22 23 74 4997878480660848787994 22 23 73 3014849211991129484103 22 23 72 1895043293663923405981 22 23 71 1685380415005140835861 22 23 70 104618510424015816401 21 21 69 89349349588594394398 20 21 68 82148829699692884128 20 21 67 53293648433484639235 20 21 66 547906983389609745 18 19 65 194216405504612491 18 19 64 190076027720670091 18 19 63 14802554345520841 17 17 62 13577478487477531 17 17 61 11199701210799111 17 17 60 11111059395011111 17 17 59 5987078778707895 16 17 58 4782537117352874 16 17 57 149819212918941 15 15 56 149285434582941 15 15 55 101904010409101 15 15 54 42143900934124 14 15 53 41275222257214 14 15 52 2081985891802 13 13 51 2024099904202 13 13 50 2005542455002 13 13 49 Prime!    1400232320041 13 13 48 827362263728 12 13 47 9565335659 10 11 46 8901111098 10 11 45 5435665345 10 11 44 382000283 9 9 43 232000232 9 9 42 181434181 9 9 41 167191761 9 9 40 65666656 8 9 39 3360633 7 7 38 3303033 7 7 37 3171713 7 7 36 3163613 7 7 35 3122213 7 7 34 3114113 7 7 33 Prime!    3106013 7 7 32 2450542 7 7 31 2442442 7 7 30 2434342 7 7 29 2401042 7 7 28 1885881 7 7 27 1877781 7 7 26 1828281 7 7 25 1721271 7 7 24 1713171 7 7 23 1540451 7 7 22 626626 6 7 21 50605 5 5 20 42324 5 5 19 27472 5 5 18 25752 5 5 17 6886 4 5 16 656 3 3 15 646 3 3 14 555 3 3 13 464 3 3 12 Prime!    373 3 3 11 282 3 3 10 Prime!    191 3 3 9 8 1 1 8 Prime!    7 1 1 7 6 1 1 6 Prime!    5 1 1 5 4 1 1 4 Prime!    3 1 1 3 Prime!    2 1 1 2 1 1 1 1 0 1 1
Index Nr Also palindromic in base 11 A029966 L base 10 L base 11 Next > 10^40 119 805046481668170326666623071866184640508 39 38 118 420588541436340950929059043634145885024 39 38 117 Prime!    333884947479382241444142283974749488333 39 37 116 242793702765993329545923399567207397242 39 37 115 169336513175538734363437835571315633961 39 37 114 165394600148133215262512331841006493561 39 37 113 4218064692602271464641722062964608124 37 36 112 Prime!    1926434676726841632361486276764346291 37 35 111 1594806282412909176719092142826084951 37 35 110 1592608289183637874787363819828062951 37 35 109 1521218725254261934391624525278121251 37 35 108 84977762954376730403767345926777948 35 34 107 82206449893985866466858939894460228 35 34 106 48420917718650618581605681771902484 35 34 105 46743025008484167976148480052034764 35 34 104 14125161341279584948597214316152141 35 33 103 13332279774919490509491947797223331 35 33 102 868468887381877757778183788864868 33 32 101 425772983781451313154187389277524 33 32 100 295736939827523464325728939637592 33 32 99 144057220417857727758714022750441 33 31 98 136944227621334171433126722449631 33 31 97 135250181395313808313593181052531 33 31 96 122410918164223656322461819014221 33 31 95 8415434201743672763471024345148 31 30 94 4870126007715524255177006210784 31 30 93 4853522495557018107555942253584 31 30 92 2352073324653701073564233702532 31 30 91 1057238711370249420731178327501 31 29 90 23587610667613731676601678532 29 28 89 10381251104807870840115218301 29 27 88 847254740425424524047452748 27 26 87 9986831781362631871386899 25 25 86 2327330239571759320337232 25 24 85 89403957605050675930498 23 23 84 27205839193739193850272 23 22 83 903253059636950352309 21 21 82 771341832818238143177 21 21 81 686833076121670338686 21 21 80 671136738666837631176 21 20 79 7861736017106371687 19 19 78 6411682614162861146 19 19 77 4244691467641964424 19 18 76 64224652625642246 17 17 75 62712119691121726 17 17 74 56831729892713865 17 17 73 56681764446718665 17 17 72 54470642224607445 17 17 71 463906656609364 15 15 70 259799383997952 15 14 69 251569181965152 15 14 68 218254595452812 15 14 67 218210353012812 15 14 66 218053292350812 15 14 65 4798641468974 13 13 64 2926072706292 13 12 63 2909278729092 13 12 62 42521012524 11 11 61 39453235493 11 11 60 39276067293 11 11 59 Prime!    999454999 9 9 58 Prime!    998111899 9 9 57 537181735 9 9 56 492080294 9 9 55 489525984 9 9 54 362151263 9 9 53 356777653 9 9 52 8844488 7 7 51 8832388 7 7 50 8820288 7 7 49 8758578 7 7 48 8746478 7 7 47 8734378 7 7 46 8722278 7 7 45 8710178 7 7 44 7292927 7 7 43 7280827 7 7 42 5741475 7 7 41 5667665 7 7 40 5655565 7 7 39 5643465 7 7 38 4593954 7 7 37 4581854 7 7 36 4422244 7 7 35 4410144 7 7 34 4348434 7 7 33 3372733 7 7 32 3360633 7 7 31 3298923 7 7 30 Prime!    3286823 7 7 29 3274723 7 7 28 3262623 7 7 27 2968692 7 7 26 2956592 7 7 25 75157 5 5 24 63936 5 5 23 52825 5 5 22 49294 5 5 21 40504 5 5 20 Prime!    38183 5 5 19 26962 5 5 18 909 3 3 17 898 3 3 16 Prime!    787 3 3 15 676 3 3 14 565 3 3 13 454 3 3 12 343 3 3 11 232 3 3 10 9 1 1 9 8 1 1 8 Prime!    7 1 1 7 6 1 1 6 Prime!    5 1 1 5 4 1 1 4 Prime!    3 1 1 3 Prime!    2 1 1 2 1 1 1 1 0 1 1	Index Nr Also palindromic in base 12 A029967 L base 10 L base 12 Next > 10^40 134 4755888058569811083663801189658508885574 40 37 133 3995222220170695314444135960710222225993 40 37 132 1213943032170148325335238410712303493121 40 37 131 754751081838594309232903495838180157457 39 37 130 627980076730872023282320278037670089726 39 36 129 581531638306604602121206406603836135185 39 36 128 49833234588031749566594713088543233894 38 35 127 17840579483436883500538863438497504871 38 35 126 9272610682900495245425940092860162729 37 35 125 5657355710268169267629618620175537565 37 35 124 5201829620960975600065790690269281025 37 35 123 3946944429423689370739863249244496493 37 34 122 3220849301981066191916601891039480223 37 34 121 870499849622183620026381226948994078 36 34 120 387046354736969929929969637453640783 36 33 119 381076184697477289982774796481670183 36 33 118 119265709545687357753786545907562911 36 33 117 85674360914151802620815141906347658 35 33 116 83493190215262260806226251209139438 35 33 115 81802752484355304240355348425720818 35 33 114 81440353578630886068803687535304418 35 33 113 81003457347079714041797074375430018 35 33 112 56319855776266958685966267755891365 35 33 111 37737225943771015251017734952273773 35 33 110 2420916232574609009064752326190242 34 31 109 1748498974051727337271504798948471 34 31 108 938622734589161131161985437226839 33 31 107 916660077846461818164648770066619 33 31 106 766683050152601878106251050386667 33 31 105 724548867150848848848051768845427 33 31 104 601400543172737757737271345004106 33 31 103 494824131789242787242987131428494 33 31 102 476819564772596505695277465918674 33 31 101 374657172139334060433931271756473 33 31 100 354965128335182939281533821569453 33 31 99 19758224106754333345760142285791 32 29 98 6771989304342285822434039891776 31 29 97 4195373068628683868268603735914 31 29 96 4151486659400331330049566841514 31 29 95 1555641809631649461369081465551 31 28 94 1290918210900549450090128190921 31 28 93 58304900850201810205800940385 29 27 92 36086256255228382255265268063 29 27 91 28536078647218981274687063582 29 27 90 24524500059831813895000542542 29 27 89 18901892348792629784329810981 29 27 88 12471218684204340248681217421 29 27 87 2850472048636336368402740582 28 26 86 936146741648181846147641639 27 25 85 812302313916343619313203218 27 25 84 778387476962626269674783877 27 25 83 773283391553515355193382377 27 25 82 753043527631868136725340357 27 25 81 496763170178515871071367694 27 25 80 227134035909707909530431722 27 25 79 224916049703484307940619422 27 25 78 146972992982696289299279641 27 25 77 98635006707833870760053689 26 25 76 29073089890344309898037092 26 24 75 7907121489697969841217097 25 24 74 5454078835683865388704545 25 23 73 5283616291585851926163825 25 23 72 5217881799729279971887125 25 23 71 4654062489875789842604564 25 23 70 2503416568872788656143052 25 23 69 1728815851659561585188271 25 23 68 1011506429055509246051101 25 23 67 791558851571175158855197 24 23 66 52713361459295416331725 23 22 65 41755364237973246355714 23 21 64 13215389880308898351231 23 21 63 7559623412002143269557 22 20 62 1693851756116571583961 22 20 61 302002264282462200203 21 19 60 283631008131800136382 21 19 59 216811149242941118612 21 19 58 52975769933996757925 20 19 57 3967113331333117693 19 18 56 3345454646464545433 19 18 55 1834592905092954381 19 17 54 1312161375731612131 19 17 53 1310127138317210131 19 17 52 926617966669716629 18 17 51 418955743347559814 18 17 50 411528847748825114 18 17 49 90145891619854109 17 16 48 16330182728103361 17 16 47 8330107227010338 16 15 46 5128288228828215 16 15 45 1643600330063461 16 15 44 62218411481226 14 13 43 10171466417101 14 13 42 4538684868354 13 12 41 357496694753 12 11 40 122507705221 12 11 39 73183838137 11 11 38 57644144675 11 10 37 50992729905 11 10 36 36265856263 11 10 35 25712321752 11 10 34 1393223931 10 9 33 796212697 9 9 32 Prime!    713171317 9 9 31 520020025 9 9 30 293373392 9 8 29 139979931 9 8 28 133373331 9 8 27 9963699 7 7 26 8364638 7 7 25 5641465 7 7 24 3192913 7 7 23 646646 6 6 22 88888 5 5 21 43934 5 5 20 35953 5 5 19 8008 4 4 18 1111 4 3 17 Prime!    797 3 3 16 737 3 3 15 676 3 3 14 616 3 3 13 555 3 3 12 Prime!    181 3 3 11 Prime!    11 2 1 10 9 1 1 9 8 1 1 8 Prime!    7 1 1 7 6 1 1 6 Prime!    5 1 1 5 4 1 1 4 Prime!    3 1 1 3 Prime!    2 1 1 2 1 1 1 1 0 1 1
Index Nr Also palindromic in base 13 A029968 L base 10 L base 13 Next > 10^40 136 876105189193280559474955082391981501678 39 35 135 808074162541146695121596641145261470808 39 35 134 611783367526788676747676887625763387116 39 35 133 517188053283694424101424496382350881715 39 35 132 461051688295800194787491008592886150164 39 35 131 432929066302814126777621418203660929234 39 35 130 294038346392100365959563001293643830492 39 35 129 267755757353332127242721233353757557762 39 35 128 192070487023689611474116986320784070291 39 35 127 68146927529085227788772258092572964186 38 34 126 6372308871584049018109404851788032736 37 34 125 5068708445833442340432443385448078605 37 33 124 4657527322452274974794722542237257564 37 33 123 4545238180587950556550597850818325454 37 33 122 4291263374656665597955666564733621924 37 33 121 4174480208807315762675137088020844714 37 33 120 2454988852206742707072476022588894542 37 33 119 1622495365957588282828857595635942261 37 33 118 532433764063585858858585360467334235 36 33 117 85915851620440146064104402615851958 35 32 116 28191109622628119691182622690119182 35 31 115 14079121922970886768807922912197041 35 31 114 7337881931120834114380211391887337 34 31 113 5432415429230593883950329245142345 34 31 112 3648221347625520110255267431228463 34 31 111 87464192944057933975044929146478 32 29 110 75823148880468411486408884132857 32 29 109 52498852650502922920505625889425 32 29 108 8876403562292024202922653046788 31 28 107 8147933782772656562772873397418 31 28 106 167537035638452254836530735761 30 27 105 5359104016316446136104019535 28 25 104 5271446936278448726396441725 28 25 103 4383787247083333807427873834 28 25 102 1585954605314884135064595851 28 25 101 726344133889939988331443627 27 25 100 434004908828616828809400434 27 24 99 41684223165077056132248614 26 23 98 36515621249188194212651563 26 23 97 32014634485388358443641023 26 23 96 27480508088033088080508472 26 23 95 9617842157193917512487169 25 23 94 8912582461133311642852198 25 23 93 8215093062131312603905128 25 23 92 8103253943611163493523018 25 23 91 8009434389290929834349008 25 23 90 3422016616206026166102243 25 23 89 97786511358585311568779 23 21 88 78337090587678509073387 23 21 87 56551454398789345415565 23 21 86 995165177898771561599 21 19 85 Prime!    970015486464684510079 21 19 84 960085137626731580069 21 19 83 958539908323809935859 21 19 82 931953637343736359139 21 19 81 832587648262846785238 21 19 80 364370458757854073463 21 19 79 292503721141127305292 21 19 78 277258880242088852772 21 19 77 162238140040041832261 21 19 76 Prime!    7520859392939580257 19 17 75 5544882623262884455 19 17 74 4002414299924142004 19 17 73 3976149369639416793 19 17 72 3898701537351078983 19 17 71 2832604939394062382 19 17 70 1836905795975096381 19 17 69 49164413731446194 17 15 68 45850453835405854 17 15 67 37079407070497073 17 15 66 7273324774233727 16 15 65 672804838408276 15 14 64 637013161310736 15 14 63 237923878329732 15 13 62 235604838406532 15 13 61 60808311380806 14 13 60 54324199142345 14 13 59 1624981894261 13 11 58 1199309039911 13 11 57 789679976987 12 11 56 22087878022 11 10 55 8390660938 10 9 54 8381551838 10 9 53 7497557947 10 9 52 7488448847 10 9 51 6933223396 10 9 50 6924114296 10 9 49 4378778734 10 9 48 4369669634 10 9 47 3814444183 10 9 46 3805335083 10 9 45 3071001703 10 9 44 952404259 9 9 43 668666866 9 8 42 656353656 9 8 41 62611626 8 7 40 47099074 8 7 39 44166144 8 7 38 33299233 8 7 37 23877832 8 7 36 23177132 8 7 35 20944902 8 7 34 20244202 8 7 33 13055031 8 7 32 10122101 8 7 31 8864688 7 7 30 2906092 7 6 29 2832382 7 6 28 2713172 7 6 27 2377732 7 6 26 311113 6 5 25 56265 5 5 24 26362 5 4 23 25452 5 4 22 24542 5 4 21 8778 4 4 20 6776 4 4 19 1111 4 3 18 Prime!    797 3 3 17 666 3 3 16 575 3 3 15 444 3 3 14 Prime!    353 3 3 13 Prime!    313 3 3 12 222 3 3 11 Prime!    11 2 1 10 9 1 1 9 8 1 1 8 Prime!    7 1 1 7 6 1 1 6 Prime!    5 1 1 5 4 1 1 4 Prime!    3 1 1 3 Prime!    2 1 1 2 1 1 1 1 0 1 1	Index Nr Also palindromic in base 14 A029969 L base 10 L base 14 Next >10^40 138 4408421224253300885995880033524221248044 40 35 137 3555271930055402325225232045500391725553 40 35 136 500032152528278296202692872825251230005 39 34 135 55147341551356712099021765315514374155 38 33 134 21840291668382562644626528386619204812 38 33 133 20879893819520542933924502591839897802 38 33 132 15755518215089623722732698051281555751 38 33 131 7447931579073846354536483709751397447 37 33 130 5482130616204198897988914026160312845 37 33 129 319396241112877001100778211142693913 36 31 128 185231481313151577775151313184132581 36 31 127 92858423335511468886411553332485829 35 31 126 76284669088387417271478388096648267 35 31 125 74140909251564452325446515290904147 35 31 124 72681490145563627172636554109418627 35 31 123 66926114867731027172013776841162966 35 31 122 61677917780460443434406408771977616 35 31 121 34236969628223549594532282696963243 35 31 120 1121304495634096006904365944031211 34 29 119 973718433518153434351815334817379 33 29 118 968391076696928565829696670193869 33 29 117 828374936373285161582373639473828 33 29 116 144305085106837868738601580503441 33 29 115 135500362603823383328306263005531 33 29 114 128202362652991646199256263202821 33 29 113 50521117516545699654561571112505 32 28 112 7335813800578148418750083185337 31 27 111 7040908186585911195856818090407 31 27 110 6713378662959123219592668733176 31 27 109 5736808560013979793100658086375 31 27 108 4213389702508657568052079833124 31 27 107 4201389584476338336744859831024 31 27 106 3686401721482618162841271046863 31 27 105 3474452803795898985973082544743 31 27 104 1211722640683103013860462271121 31 27 103 1166612828929286829298282166611 31 27 102 597768358532307703235853867795 30 26 101 37455515294427472449251555473 29 25 100 31717782582145754128528771713 29 25 99 27616294752022522025749261672 29 25 98 26877327637008480073672377862 29 25 97 21860447828928382982874406812 29 25 96 Prime!    19119657727650105672775691191 29 25 95 16135925622565856522652953161 29 25 94 8388919200061221600029198838 28 25 93 8387173664400220044663717838 28 25 92 208029399678414876993920802 27 23 91 205555244980252089442555502 27 23 90 189637992886868688299736981 27 23 89 184173299165494561992371481 27 23 88 156024115587707785511420651 27 23 87 128443695003131300596344821 27 23 86 5961305517300037155031695 25 22 85 1166461071537351701646611 25 21 84 964891286547745682198469 24 21 83 301347778352253877743103 24 21 82 56460795211711259706465 23 20 81 54996016941314961069945 23 20 80 4513013721551273103154 22 19 79 1620544341441434450261 22 19 78 756517966373669715657 21 19 77 535729030313030927535 21 19 76 531011782080287110135 21 19 75 59380193522539108395 20 18 74 59236342599524363295 20 18 73 26916102000020161962 20 17 72 15595183733738159551 20 17 71 15319521066012591351 20 17 70 7327284858584827237 19 17 69 7209611033301169027 19 17 68 6158981849481898516 19 17 67 6114506601066054116 19 17 66 6005359623269535006 19 17 65 3737334250524337373 19 17 64 3545494238324945453 19 17 63 546546033330645645 18 16 62 78325277777252387 17 15 61 69580792329708596 17 15 60 68300282528200386 17 15 59 57047363236374075 17 15 58 26072218381227062 17 15 57 24514444744441542 17 15 56 13955648684655931 17 15 55 5902037117302095 16 14 54 765611080116567 15 13 53 756559989955657 15 13 52 692021131120296 15 13 51 611552272255116 15 13 50 475794747497574 15 13 49 306149949941603 15 13 48 253675545576352 15 13 47 236070676070632 15 13 46 5813343433185 13 12 45 5542179712455 13 12 44 5530138310355 13 12 43 5507474747055 13 12 42 5105070705015 13 12 41 3984321234893 13 11 40 2428022208242 13 11 39 1098445448901 13 11 38 1031186811301 13 11 37 695256652596 12 11 36 549905509945 12 11 35 518032230815 12 11 34 508628826805 12 11 33 17085058071 11 9 32 Prime!    14203330241 11 9 31 11652825611 11 9 30 10476867401 11 9 29 6758008576 10 9 28 5736116375 10 9 27 595121595 9 8 26 564303465 9 8 25 535505535 9 8 24 9813189 7 7 23 9578759 7 7 22 Prime!    9046409 7 7 21 546645 6 6 20 420024 6 5 19 59095 5 5 18 39593 5 5 17 1111 4 3 16 999 3 3 15 858 3 3 14 717 3 3 13 464 3 3 12 323 3 3 11 Prime!    11 2 1 10 9 1 1 9 8 1 1 8 Prime!    7 1 1 7 6 1 1 6 Prime!    5 1 1 5 4 1 1 4 Prime!    3 1 1 3 Prime!    2 1 1 2 1 1 1 1 0 1 1
Index Nr Also palindromic in base 15 A029970 L base 10 L base 15 Next > 10^40 112 679264379358779716545617977853973462976 39 34 111 671834994278921128575821129872499438176 39 34 110 671823954129176475898574671921459328176 39 34 109 671801876943677750717057776349678108176 39 34 108 422514634668141175646571141866436415224 39 33 107 377984512498852558090855258894215489773 39 33 106 377040997185785660313066587581799040773 39 33 105 367047203696476366303663674696302740763 39 33 104 2465317254219799331339979124527135642 37 31 103 2464771698432245335335422348961774642 37 31 102 2401720184706483985893846074810271042 37 31 101 1299678150037532523252357300518769921 37 31 100 1232682828202175856585712028282862321 37 31 99 10010751835197275757279153815701001 35 29 98 4029381831399520110259931381839204 34 29 97 2033482880217142662417120882843302 34 29 96 658173231572857909758275132371856 33 28 95 32050202833356166165333820205023 32 27 94 6663858995860188810685998583666 31 27 93 6302046273511804081153726402036 31 27 92 865592888627805508726888295568 30 26 91 863098167079329923970761890368 30 26 90 863047633478586685874336740368 30 26 89 135161964901080109469161531 27 23 88 104044592149404941295440401 27 23 87 6731977278048408727791376 25 22 86 4923326192119112916233294 25 21 85 4849039926081806299309484 25 21 84 4849039925419145299309484 25 21 83 4669468757735377578649664 25 21 82 2509825693739373965289052 25 21 81 2430947083422243807490342 25 21 80 2331266282958592826621332 25 21 79 17686788963236988768671 23 19 78 17215321150905112351271 23 19 77 17173183047874038137171 23 19 76 16257555683438655575261 23 19 75 637477940656049774736 21 18 74 637223253909352322736 21 18 73 89551457844875415598 20 17 72 6747920044400297476 19 17 71 6736942564652496376 19 17 70 4038582985892858304 19 16 69 427791895598197724 18 15 68 194176722227671491 18 15 67 74940172027104947 17 15 66 Prime!    74713184748131747 17 15 65 74712906560921747 17 15 64 74712663536621747 17 15 63 284111151111482 15 13 62 283652313256382 15 13 61 141527282725141 15 13 60 42629999992624 14 12 59 40700399300704 14 12 58 8004830384008 13 11 57 7485535355847 13 11 56 7305480845037 13 11 55 7073218123707 13 11 54 7073152513707 13 11 53 6908732378096 13 11 52 6907268627096 13 11 51 6799415149976 13 11 50 6637917197366 13 11 49 6624883884266 13 11 48 6624024204266 13 11 47 6498409048946 13 11 46 6498343438946 13 11 45 5938567658395 13 11 44 1131877781311 13 11 43 1131018101311 13 11 42 692465564296 12 11 41 615221122516 12 11 40 20281518202 11 9 39 17406960471 11 9 38 8083223808 10 9 37 8052662508 10 9 36 8050880508 10 9 35 2118008112 10 8 34 69455496 8 7 33 47999974 8 7 32 39399393 8 7 31 28300382 8 7 30 26144162 8 7 29 17577571 8 7 28 527725 6 5 27 515515 6 5 26 489984 6 5 25 477774 6 5 24 465564 6 5 23 67576 5 5 22 60106 5 5 21 25552 5 4 20 23632 5 4 19 2772 4 3 18 1551 4 3 17 979 3 3 16 949 3 3 15 Prime!    919 3 3 14 888 3 3 13 858 3 3 12 828 3 3 11 Prime!    11 2 1 10 9 1 1 9 8 1 1 8 Prime!    7 1 1 7 6 1 1 6 Prime!    5 1 1 5 4 1 1 4 Prime!    3 1 1 3 Prime!    2 1 1 2 1 1 1 1 0 1 1	Index Nr Also palindromic in base 16 A029731 L base 10 L base 16 Next > 10^40 164 5473604055870043773553773400785504063745 40 34 163 5311599202354023999339993204532029951135 40 33 162 5140029220051848190220918481500229200415 40 33 161 3845811564899008601001068009984651185483 40 33 160 3170100710011667952882597661100170010713 40 33 159 2079996919666355959999595536669196999702 40 33 158 1101695289629382147557412839269825961011 40 33 157 831184236629406434060434604926632481138 39 33 156 372215423950901062444260109059324512273 39 33 155 353826224764936423313324639467422628353 39 33 154 221851300741310141858141013147003158122 39 32 153 62834817124495956688665959442171843826 38 32 152 9994447718384266039306624838177444999 37 31 151 8551166443022114842484112203446611558 37 31 150 7971748895919445718175449195988471797 37 31 149 7916089787430257387837520347879806197 37 31 148 7344534647980282474742820897464354437 37 31 147 5116780321574030276720304751230876115 37 31 146 2675804851621517358537151261584085762 37 31 145 1441301694046455054505546404961031441 37 31 144 1323759379857863561653687589739573231 37 30 143 78894191945563376367336554919149887 35 29 142 67080932508181062626018180523908076 35 29 141 63835882500017943434971000528853836 35 29 140 63494339670590336663309507693349436 35 29 139 57486792197841346664314879129768475 35 29 138 46494289039985405650458993098249464 35 29 137 36453210513649714141794631501235463 35 29 136 25295130572966082928066927503159252 35 29 135 17193090890651737173715609809039171 35 29 134 589179652669993373399966256971985 33 28 133 324193060418058060850814060391423 33 27 132 322434305921054020450129503434223 33 27 131 188980399889523060325988993089881 33 27 130 157124568577706949607775865421751 33 27 129 153570961886167878761688169075351 33 27 128 74310782571520833802517528701347 32 27 127 47204048169521688612596184040274 32 27 126 9578569814271350531724189658759 31 26 125 7308855736123322233216375588037 31 26 124 1097029772441563651442779207901 31 25 123 494506253843744447348352605494 30 25 122 94694284038931313983048249649 29 25 121 94635334973676267637943353649 29 25 120 92167013075480608457031076129 29 25 119 17173681623264946232618637171 29 24 118 4526239847945445497489326254 28 23 117 4374175479923993299745714734 28 23 116 2092577007449999447007752902 28 23 115 875288502888989888205882578 27 23 114 374178087384212483780871473 27 23 113 319895202367858763202598913 27 23 112 107761099424686424990167701 27 22 111 107527175676494676571725701 27 22 110 43231887066299266078813234 26 22 109 37264989541299214598946273 26 22 108 9133129628211128269213319 25 21 107 1846781136065606311876481 25 21 106 Prime!    1844238058789878508324481 25 21 105 1829860070497940700689281 25 21 104 1013945256196916525493101 25 20 103 66346948489298484964366 23 19 102 55582430128882103428555 23 19 101 51959301115851110395915 23 19 100 47844728597079582744874 23 19 99 47272007451015470027274 23 19 98 42001490723332709410024 23 19 97 36039109398989390193063 23 19 96 34570154169596145107543 23 19 95 34175825152525152857143 23 19 94 28527697711011779672582 23 19 93 21471020918081902017412 23 19 92 17322666253735266622371 23 19 91 15673605260306250637651 23 19 90 873954892151298459378 21 18 89 264605616858616506462 21 17 88 180766294494492667081 21 17 87 136228674727476822631 21 17 86 134132582494285231431 21 17 85 109640971252179046901 21 17 84 105086879868978680501 21 17 83 70701884511548810707 20 17 82 41317967000076971314 20 17 81 4616159308039516164 19 16 80 3884425716175244883 19 16 79 1137081002001807311 19 15 78 1118494603064948111 19 15 77 887358331133853788 18 15 76 535873916619378535 18 15 75 373019805508910373 18 15 74 70667820502876607 17 14 73 64634327472343646 17 14 72 32633196169133623 17 14 71 32000428082400023 17 14 70 5099347667439905 16 14 69 1668739779378661 16 13 68 816346555643618 15 13 67 522013020310225 15 13 66 509538666835905 15 13 65 Prime!    397922151229793 15 13 64 45113388331154 14 12 63 17262755726271 14 11 62 14315822851341 14 11 61 7888195918887 13 11 60 6694367634966 13 11 59 Prime!    3405684865043 13 11 58 2692667662962 13 11 57 2424058504242 13 11 56 1806872786081 13 11 55 1631645461361 13 11 54 1278169618721 13 11 53 390189981093 12 10 52 56702120765 11 9 51 51113531115 11 9 50 45961216954 11 9 49 43836363834 11 9 48 39762526793 11 9 47 32442924423 11 9 46 30144644103 11 9 45 28779897782 11 9 44 28586268582 11 9 43 26896769862 11 9 42 247969742 9 7 41 241090142 9 7 40 Prime!    190080091 9 7 39 161131161 9 7 38 119919911 9 7 37 94544549 8 7 36 94355349 8 7 35 90999909 8 7 34 67433476 8 7 33 9616169 7 6 32 6487846 7 6 31 5614165 7 6 30 2485842 7 6 29 1612161 7 6 28 845548 6 5 27 749947 6 5 26 666666 6 5 25 512215 6 5 24 333333 6 5 23 Prime!    98689 5 5 22 96369 5 5 21 Prime!    94049 5 5 20 90209 5 5 19 41514 5 4 18 39593 5 4 17 3003 4 3 16 1991 4 3 15 979 3 3 14 Prime!    787 3 3 13 626 3 3 12 Prime!    353 3 3 11 Prime!    11 2 1 10 9 1 1 9 8 1 1 8 Prime!    7 1 1 7 6 1 1 6 Prime!    5 1 1 5 4 1 1 4 Prime!    3 1 1 3 Prime!    2 1 1 2 1 1 1 1 0 1 1
Index Nr Also palindromic in base 17 A097855 L base 10 L base 17 Next > 10^40 150 7094289105127201782332871027215019824907 40 33 149 6686483035707456865445686547075303846866 40 33 148 602346347358444150969051444853743643206 39 32 147 266376469117570995282599075711964673662 39 32 146 94253875370609193699639190607357835249 38 31 145 55121859711953084655648035911795812155 38 31 144 53209578652762273244237226725687590235 38 31 143 51960762130926578088087562903126706915 38 31 142 40796873952264456966965446225937869704 38 31 141 18727783764608607611670680646738772781 38 31 140 8752808049712280306030822179408082578 37 31 139 6298215199051066029206601509915128926 37 30 138 4623678535219203142413029125358763264 37 30 137 365540306224540615516045422603045563 36 29 136 90276905391591422722419519350967209 35 29 135 85501557947534578487543574975510558 35 29 134 65761939900777596269577700993916756 35 29 133 49351430497151763836715179403415394 35 29 132 1307407821986290990926891287047031 34 27 131 940811604562190575091265406118049 33 27 130 831970393975861444168579393079138 33 27 129 812528427443654595456344724825218 33 27 128 604011812801426565624108218110406 33 27 127 457003435707826393628707534300754 33 27 126 371742125117392525293711521247173 33 27 125 344189450267018797810762054981443 33 27 124 210157127471717434717174721751012 33 27 123 205020978146736050637641879020502 33 27 122 200195989377362777263773989591002 33 27 121 157314984017499868994710489413751 33 27 120 63774941000065299256000014947736 32 26 119 63377847267663511536676274877336 32 26 118 4414647629153170713519267464144 31 25 117 4327516389629800089269836157234 31 25 116 3818976562986723276892656798183 31 25 115 3753610933851839381583390163573 31 25 114 3735333389910124210199833335373 31 25 113 3518425012012356532102105248153 31 25 112 3391760004997692967994000671933 31 25 111 2132729073118137318113709272312 31 25 110 1810280510255136315520150820181 31 25 109 1358735829548443448459285378531 31 25 108 1326523932177251527712393256231 31 25 107 776682722437872278734227286677 30 25 106 417425269522880088225962524714 30 25 105 62557197811843134811879175526 29 24 104 49913576766492629466767531994 29 24 103 48202421808035553080812420284 29 24 102 28596676687767976778667669582 29 24 101 14039316026076967062061393041 29 23 100 8918655250701441070525568198 28 23 99 6160775118020000208115770616 28 23 98 5630538236237997326328350365 28 23 97 1983108197444114447918013891 28 23 96 1657055627193883917265507561 28 23 95 487379852885626588258973784 27 22 94 223410007274737472700014322 27 22 93 51000979792133129797900015 26 21 92 50026374092611629047362005 26 21 91 10563312887866878821336501 26 21 90 8649661542472742451669468 25 21 89 96861480083538008416869 23 19 88 92024357092229075342029 23 19 87 80175190436063409157108 23 19 86 78775409665456690457787 23 19 85 51298480926462908489215 23 19 84 51248828705350782884215 23 19 83 39016629568786592661093 23 19 82 28406991917371919960482 23 19 81 20345223059695032254302 23 19 80 771304735727537403177 21 17 79 746168755434557861647 21 17 78 591483358666853384195 21 17 77 448054503626305450844 21 17 76 435704288777882407534 21 17 75 416995904070409599614 21 17 74 271064428606824460172 21 17 73 238581323393323185832 21 17 72 194017571010175710491 21 17 71 113481483222384184311 21 17 70 4552204672764022554 19 16 69 2552577177717752552 19 15 68 1561203188813021651 19 15 67 763504480084405367 18 15 66 395414871178414593 18 15 65 327224207702422723 18 15 64 174670389983076471 18 15 63 85437364146373458 17 14 62 47548262526284574 17 14 61 41285701710758214 17 14 60 40101963636910104 17 14 59 29287621712678292 17 14 58 20378349094387302 17 14 57 7351755005571537 16 13 56 6905270220725096 16 13 55 965201404102569 15 13 54 406631878136604 15 12 53 19038433483091 14 11 52 14705022050741 14 11 51 4244405044424 13 11 50 650880088056 12 10 49 494280082494 12 10 48 493533335394 12 10 47 98794149789 11 9 46 91792829719 11 9 45 77991919977 11 9 44 72603630627 11 9 43 68921312986 11 9 42 58802720885 11 9 41 57431913475 11 9 40 30873037803 11 9 39 2038558302 10 8 38 335929533 9 7 37 280535082 9 7 36 229232922 9 7 35 212313212 9 7 34 208373802 9 7 33 207535702 9 7 32 124454421 9 7 31 123616321 9 7 30 103595301 9 7 29 102757201 9 7 28 31744713 8 7 27 8837388 7 6 26 4165614 7 6 25 1388831 7 5 24 335533 6 5 23 256652 6 5 22 177771 6 5 21 94249 5 5 20 61416 5 4 19 4554 4 3 18 2882 4 3 17 989 3 3 16 818 3 3 15 767 3 3 14 545 3 3 13 494 3 3 12 252 3 2 11 Prime!    11 2 1 10 9 1 1 9 8 1 1 8 Prime!    7 1 1 7 6 1 1 6 Prime!    5 1 1 5 4 1 1 4 Prime!    3 1 1 3 Prime!    2 1 1 2 1 1 1 1 0 1 1	Index Nr Also palindromic in base 18 A248889 L base 10 L base 18 Next > 10^40 173 790232054190235813141318532091450232097 39 31 172 775254532842182866909668281248235452577 39 31 171 716803652633659581999185956336256308617 39 31 170 536322121357692627686726296753121223635 39 31 169 531186519783669862858268966387915681135 39 31 168 529234297758411547939745114857792432925 39 31 167 492600731898304583363385403898137006294 39 31 166 468517760410345456848654543014067715864 39 31 165 291888114614362426313624263416411888192 39 31 164 283896193963470326080623074369391698382 39 31 163 169861190379809965727569908973091168961 39 31 162 77113932252158894099049885125223931177 38 31 161 53246398942304474099047440324989364235 38 31 160 21444402810341425099052414301820444412 38 30 159 9413512848042828450548282408482153149 37 30 158 3833336883461274803084721643886333383 37 30 157 3244931859193639054509363919581394423 37 30 156 2034836908914605176715064198096384302 37 29 155 1961247587329253041403529237857421691 37 29 154 Prime!    1684517182328146273726418232817154861 37 29 153 1325425475882021343431202885745245231 37 29 152 888366461659623498894326956164663888 36 29 151 878643448505048676676840505844346878 36 29 150 6353895620579332332339750265983536 34 27 149 6113004055394498888944935504003116 34 27 148 5834613903121658008561213093164385 34 27 147 3288689606434251551524346069868823 34 27 146 3057715369150752552570519635177503 34 27 145 2813048691867323443237681968403182 34 27 144 1429092118889297777929888112909241 34 27 143 891047422248102353201842224740198 33 27 142 767177472903747484747309274771767 33 27 141 587967193446798868897644391769785 33 27 140 515504824698035969530896428405515 33 27 139 512541797867064424460768797145215 33 27 138 515504824698035969530896428405515 33 27 137 214370258225450646054522852073412 33 26 136 176893833620784505487026338398671 33 26 135 175291363108049060940801363192571 33 26 134 133365669597296565692795966563331 33 26 133 17830705632171144117123650703871 32 25 132 15051559388218211281288395515051 32 25 131 8957581607343311133437061857598 31 25 130 8939963722065101015602273699398 31 25 129 8262258543720963690273458522628 31 25 128 7315073616124568654216163705137 31 25 127 7092543719554467644559173452907 31 25 126 6596260497441691961447940626956 31 25 125 2766149693557063607553969416672 31 25 124 561052048322087780223840250165 30 24 123 114928088787644446787880829411 30 24 122 73483486387308880378368438437 29 23 121 68618464148528082584146481686 29 23 120 67590693127613331672139609576 29 23 119 66499613003382428330031699466 29 23 118 54753848621729692712684835745 29 23 117 49857654147131813174145675894 29 23 116 44781169492686468629496118744 29 23 115 43786895205724542750259868734 29 23 114 39980524465547274556442508993 29 23 113 26647944502252725220544974662 29 23 112 24968337496312721369473386942 29 23 111 16402606101818581810160620461 29 23 110 13826198664047874046689162831 29 23 109 150761331188787881133167051 27 21 108 124750919020838020919057421 27 21 107 85169284001677610048296158 26 21 106 29568704310555501340786592 26 21 105 4691476617903097166741964 25 20 104 4295903313549453133095924 25 20 103 3724548182702072818454273 25 20 102 714235187534435781532417 24 20 101 422081779154451977180224 24 19 100 58146697067976079664185 23 19 99 55870485308380358407855 23 19 98 55542157749194775124555 23 19 97 55001985269996258910055 23 19 96 51312119346164391121315 23 19 95 15848644772327744684851 23 18 94 1664347145665417434661 22 17 93 1438380451991540838341 22 17 92 Prime!    903541215424512145309 21 17 91 803007201999102700308 21 17 90 384210498636894012483 21 17 89 383376182353281673383 21 17 88 381174569131965471183 21 17 87 285126074787470621582 21 17 86 278852001404100258872 21 17 85 254290136919631092452 21 17 84 156285320828023582651 21 17 83 41470196888869107414 20 16 82 5827580384830857285 19 15 81 5812958640468592185 19 15 80 5725600893980065275 19 15 79 5052817248427182505 19 15 78 4804809688869084084 19 15 77 3497509383839057943 19 15 76 3489855513155589843 19 15 75 3377352952592537733 19 15 74 2528468040408648252 19 15 73 2525541666661455252 19 15 72 2432426921296242342 19 15 71 2324074260624704232 19 15 70 1884584402044854881 19 15 69 1129798206028979211 19 15 68 104737165561737401 18 14 67 18245601610654281 17 13 66 11247779597774211 17 13 65 4725393553935274 16 13 64 4671431331341764 16 13 63 3496774224776943 16 13 62 1511668448661151 16 13 61 427740777047724 15 12 60 385281878182583 15 12 59 56203688630265 14 11 58 35334455443353 14 11 57 5764436344675 13 11 56 3968412148693 13 11 55 3376963696733 13 10 54 2557615167552 13 10 53 188833338881 12 9 52 Prime!    79288288297 11 9 51 69675357696 11 9 50 59388288395 11 9 49 58813031885 11 9 48 26965056962 11 9 47 14969696941 11 9 46 387191783 9 7 45 Prime!    386454683 9 7 44 385717583 9 7 43 376222673 9 7 42 327696723 9 7 41 326959623 9 7 40 221050122 9 7 39 220313022 9 7 38 191010191 9 7 37 118919811 9 7 36 88844888 8 7 35 55499455 8 7 34 54411445 8 7 33 39388393 8 7 32 Prime!    1832381 7 5 31 1403041 7 5 30 1254521 7 5 29 981189 6 5 28 859958 6 5 27 782287 6 5 26 583385 6 5 25 262262 6 5 24 69996 5 4 23 46664 5 4 22 23332 5 4 21 3773 4 3 20 2112 4 3 19 1661 4 3 18 848 3 3 17 686 3 3 16 595 3 3 15 505 3 3 14 343 3 3 13 323 3 2 12 171 3 2 11 Prime!    11 2 1 10 9 1 1 9 8 1 1 8 Prime!    7 1 1 7 6 1 1 6 Prime!    5 1 1 5 4 1 1 4 Prime!    3 1 1 3 Prime!    2 1 1 2 1 1 1 1 0 1 1
Index Nr Also palindromic in base 19 A248899 L base 10 L base 19 Next > 10^40 119 4343616208418790191111910978148026163434 40 31 118 4324692211282684569669654862821122964234 40 31 117 3554902865823207723773277023285682094553 40 31 116 2483009467340046813003186400437649003842 40 31 115 751421588983127436333634721389885124157 39 31 114 485549818666377887303788773666818945584 39 31 113 309584831738249155262551942837138485903 39 31 112 9362863089490801106011080949803682639 37 29 111 9017808257900460006000640097528087109 37 29 110 8690309807321976313136791237089030968 37 29 109 7400786625791150567650511975266870047 37 29 108 7306827739906870424240786099377286037 37 29 107 7080699879265818112118185629789960807 37 29 106 6655712119525842119112485259112175566 37 29 105 6368969092284111631361114822909698636 37 29 104 6072588297549468799978649457928852706 37 29 103 5794362256816152056502516186522634975 37 29 102 4469182449039545473745459309442819644 37 29 101 4052537476122169122219612216747352504 37 29 100 2022382454446573891983756444542832202 37 29 99 1212304494695145903095415964944032121 37 29 98 11707801626775623232657762610870711 35 27 97 8828105206341536556351436025018288 34 27 96 5297048715231908668091325178407925 34 27 95 4875799748907564554657098479975784 34 27 94 63715023020626800862602032051736 32 25 93 41640203648960699606984630204614 32 25 92 17770728877704244240777882707771 32 25 91 6554490842352029202532480944556 31 25 90 95851899579081618097599815859 29 23 89 91078313406122722160431387019 29 23 88 90212534751173737115743521209 29 23 87 71996461177172527177116469917 29 23 86 49467971192371217329117976494 29 23 85 45374859625804540852695847354 29 23 84 30944963383179297138336944903 29 23 83 27043497314412121441379434072 29 23 82 22728414363435953436341482722 29 23 81 14358494435120502153449485341 29 23 80 662175008792353297800571266 27 21 79 654677338038101830833776456 27 21 78 561045025884282488520540165 27 21 77 506269673038969830376962605 27 21 76 428876141557060755141678824 27 21 75 408868513790010097315868804 27 21 74 402127887284989482788721204 27 21 73 308168122754090457221861803 27 21 72 300795068727858727860597003 27 21 71 132260946857686758649062231 27 21 70 106639591224606422195936601 27 21 69 1207643545431345453467021 25 19 68 997147468958859864741799 24 19 67 584912832574475238219485 24 19 66 281752012447744210257182 24 19 65 4087761368448631677804 22 17 64 3295450807337080545923 22 17 63 845590859717958095548 21 17 62 801941048666840149108 21 17 61 345188245595542881543 21 17 60 11330422577522403311 20 15 59 9611176039306711169 19 15 58 9333120815180213339 19 15 57 8705115152515115078 19 15 56 8507775490945777058 19 15 55 7401130704070311047 19 15 54 7382719398939172837 19 15 53 6510099759579900156 19 15 52 5846194156514916485 19 15 51 4502146351536412054 19 15 50 4306351929291536034 19 15 49 3695653224223565963 19 15 48 41530875757803514 17 13 47 33670675157607633 17 13 46 30676982028967603 17 13 45 21858850305885812 17 13 44 18057661216675081 17 13 43 10365316861356301 17 13 42 8328654774568238 16 13 41 2794478998744972 16 13 40 2696617447166962 16 13 39 6976862686796 13 11 38 6959926299596 13 11 37 246025520642 12 9 36 234595595432 12 9 35 139103301931 12 9 34 127673376721 12 9 33 121791197121 12 9 32 96060106069 11 9 31 87161116178 11 9 30 67269596276 11 9 29 62558085526 11 9 28 47069796074 11 9 27 863828368 9 7 26 857383758 9 7 25 666909666 9 7 24 650767056 9 7 23 467535764 9 7 22 453848354 9 7 21 Prime!    330050033 9 7 20 Prime!    155292551 9 7 19 2211122 7 5 18 1897981 7 5 17 Prime!    1551551 7 5 16 864468 6 5 15 432234 6 5 14 1771 4 3 13 838 3 3 12 666 3 3 11 Prime!    11 2 1 10 9 1 1 9 8 1 1 8 Prime!    7 1 1 7 6 1 1 6 Prime!    5 1 1 5 4 1 1 4 Prime!    3 1 1 3 Prime!    2 1 1 2 1 1 1 1 0 1 1	Index Nr Also palindromic in base 20 A250408 L base 10 L base 20 Next > 10^40 221 9886168445788893141771413988875448616889 40 31 220 8848959510712638610770168362170159598488 40 31 219 8806393843282446060330606442823483936088 40 31 218 8806393670085994156666514995800763936088 40 31 217 8806355859647614048558404167469585536088 40 31 216 8806355855408620062552600268045585536088 40 31 215 6646489319719326120440216239179139846466 40 31 214 6627437460087380351221530837800647347266 40 31 213 6604621911974661773663771664791191264066 40 31 212 5898740959025234804884084325209590478985 40 31 211 5898156797399826530550356289937976518985 40 31 210 5877856300923159642112469513290036587785 40 31 209 5877854468457099802002089907548644587785 40 31 208 5856968146636394266886624936366418696585 40 31 207 5856901217463584777337774853647121096585 40 31 206 5856317224373658274774728563734227136585 40 31 205 5856315724960934465775644390694275136585 40 31 204 4404853586169940003223000499616853584044 40 31 203 4404204168407319722332279137048614024044 40 31 202 4404202419471999057007509991749142024044 40 31 201 4402958706676512653443562156766078592044 40 31 200 4402958702640383121991213830462078592044 40 31 199 3698972396262107539999357012626932798963 40 31 198 3698972312076321851331581236702132798963 40 31 197 3698934328450079031771309700548234398963 40 31 196 3675538601125981400660041895211068355763 40 31 195 1496616623375472128778212745733266166941 40 31 194 1454667205991339409449049331995027664541 40 31 193 1454665553819152938888392519183555664541 40 31 192 1454016369177397335225337937719636104541 40 31 191 37347496071367073477437076317069474373 38 29 190 1560833389725872591952785279833380651 37 28 189 1560666708282522625262252828076660651 37 28 188 12345427181474635753647418172454321 35 27 187 12345406230917366866371903260454321 35 27 186 12345214190260052525006209141254321 35 27 185 Prime!    12345009773704925152940737790054321 35 27 184 12341231973910821312801937913214321 35 27 183 12341210492627740904772629401214321 35 27 182 12199273085156279297265158037299121 35 27 181 12199068645843235053234854686099121 35 27 180 3213546057808432348087506453123 31 24 179 3213544703252812182523074453123 31 24 178 1619853610291648461920163589161 31 24 177 714218398654660066456893812417 30 23 176 691024876791993399197678420196 30 23 175 691022154286947749682451220196 30 23 174 25965145712184048121754156952 29 22 173 25963800156370407365100836952 29 22 172 962966507892161298705669269 27 21 171 962966507497959794705669269 27 21 170 962903124428373824421309269 27 21 169 962903124407616704421309269 27 21 168 960856587864151468785658069 27 21 167 960856562315777513265658069 27 21 166 889279129597474795921972988 27 21 165 889279129576717675921972988 27 21 164 889279121729171927121972988 27 21 163 889275744941161149447572988 27 21 162 889275744920404029447572988 27 21 161 889275744546959645447572988 27 21 160 889275744508555805447572988 27 21 159 887351293860656068392153788 27 21 158 887165995693171396599561788 27 21 157 887165995672414276599561788 27 21 156 887165995298969892599561788 27 21 155 887165514528444825415561788 27 21 154 887102300163151361003201788 27 21 153 781253294039686930492352187 27 21 152 644072982720101027289270446 27 21 151 569634548185565581845436965 27 21 150 569634523837565738325436965 27 21 149 569634523816808618325436965 27 21 148 569634523031393130325436965 27 21 147 567524122545323545221425765 27 21 146 465640403379212973304046564 27 21 145 463599736310494013637995364 27 21 144 461489987041747140789984164 27 21 143 461483277083414380772384164 27 21 142 461483277045010540772384164 27 21 141 461422729604545406927224164 27 21 140 428045227346787643722540824 27 21 139 428041842751606157248140824 27 21 138 428041842339757933248140824 27 21 137 324243113781181187311342423 27 21 136 324243113760424067311342423 27 21 135 324057492570656075294750423 27 21 134 324057492532252235294750423 27 21 133 288324351188878881153423882 27 21 132 288136186202969202681631882 27 21 131 286214585127969721585412682 27 21 130 286214568609868906865412682 27 21 129 286028610260828062016820682 27 21 128 284100936710303017639001482 27 21 127 249801123833040338321108942 27 21 126 249619202849111948202916942 27 21 125 249619202826383628202916942 27 21 124 249615842167353761248516942 27 21 123 249615842123868321248516942 27 21 122 249615825649252946528516942 27 21 121 247509096358565853690905742 27 21 120 247505253657484756352505742 27 21 119 247505253636727636352505742 27 21 118 247505253613999316352505742 27 21 117 247505238405828504832505742 27 21 116 182287014089545980410782281 27 21 115 182226164194989491461622281 27 21 114 180179927575949575729971081 27 21 113 180173048791666197840371081 27 21 112 180116390972444279093611081 27 21 111 180116390598999895093611081 27 21 110 145876925622010226529678541 27 21 109 145876925227808722529678541 27 21 108 145876585192373291585678541 27 21 107 145870215645979546512078541 27 21 106 145870046487010784640078541 27 21 105 Prime!    145813396492606294693318541 27 21 104 145813396454202454693318541 27 21 103 145813379974505479973318541 27 21 102 143766507892161298705667341 27 21 101 143766507497959794705667341 27 21 100 143703124428373824421307341 27 21 99 143703124407616704421307341 27 21 98 141656587864151468785656141 27 21 97 141656562315777513265656141 27 21 96 108218383371898173383812801 27 21 95 3566396394241424936936653 25 18 94 3566379417412147149736653 25 18 93 155778498219912894877551 24 18 92 155753084664466480357551 24 18 91 14821871469396417812841 23 18 90 517473208373802374715 21 16 89 517049175282571940715 21 16 88 517026072333270620715 21 16 87 517009056525650900715 21 16 86 471884799999997488174 21 16 85 105878013310878501 18 14 84 71874813431847817 17 13 83 71831895259813817 17 13 82 69517556065571596 17 13 81 69515054645051596 17 13 80 69515035653051596 17 13 79 67316423732461376 17 13 78 67316404740461376 17 13 77 67314157075141376 17 13 76 67182731613728176 17 13 75 67180087178008176 17 13 74 2533637117363352 16 12 73 2533401331043352 16 12 72 115629444926511 15 11 71 115488939884511 15 11 70 115482777284511 15 11 69 115482161284511 15 11 68 115238181832511 15 11 67 112989686989211 15 11 66 112983848389211 15 11 65 112739252937211 15 11 64 112733414337211 15 11 63 112733090337211 15 11 62 96757333375769 14 11 61 96544000044569 14 11 60 92862200226829 14 11 59 86356300365368 14 11 58 82885700758828 14 11 57 82868066086828 14 11 56 76185311358167 14 11 55 76160000006167 14 11 54 72697077079627 14 11 53 72691155119627 14 11 52 72678611687627 14 11 51 72279011097227 14 11 50 68857077075886 14 11 49 68851155115886 14 11 48 68838611683886 14 11 47 62296044069226 14 11 46 62089899898026 14 11 45 58667622676685 14 11 44 58661700716685 14 11 43 58456044065485 14 11 42 54985444458945 14 11 41 48479922997484 14 11 40 48473077037484 14 11 39 44778355387744 14 11 38 44584411448544 14 11 37 38283622638283 14 11 36 38072044027083 14 11 35 28095922959082 14 11 34 14102600620141 14 11 33 10614366341601 14 11 32 355746647553 12 9 31 355110011553 12 9 30 334843348433 12 9 29 334495594433 12 9 28 1444884441 10 8 27 1919191 7 5 26 Prime!    1917191 7 5 25 1915191 7 5 24 1913191 7 5 23 1788871 7 5 22 1786871 7 5 21 1784871 7 5 20 30303 5 4 19 22722 5 4 18 20202 5 4 17 12621 5 4 16 10101 5 4 15 7117 4 3 14 6776 4 3 13 6556 4 3 12 252 3 2 11 Prime!    11 2 1 10 9 1 1 9 8 1 1 8 Prime!    7 1 1 7 6 1 1 6 Prime!    5 1 1 5 4 1 1 4 Prime!    3 1 1 3 Prime!    2 1 1 2 1 1 1 1 0 1 1
Index Nr Also palindromic in base 21 L base 10 L base 21 Next > 10^40 195 5281873272496230029999200326942723781825 40 31 194 4244383707323076854334586703237073834424 40 30 193 2526904339244526741441476254429334096252 40 30 192 2384040109392817522442257182939010404832 40 30 191 2160882485988705522662255078895842880612 40 30 190 689797143147141986242689141741341797986 39 30 189 205821873536541712767217145635378128502 39 29 188 205451611326304594353495403623116154502 39 29 187 205292931341414326404623414143139292502 39 29 186 124144819840196827171728691048918441421 39 29 185 84182707940873445388354437804970728148 38 29 184 74872713289656362511526365698231727847 38 29 183 61190110173825292244229252837101109116 38 29 182 17925336532648783433438784623563352971 38 29 181 861142963306019990099910603369241168 36 28 180 833313005313630626626036313500313338 36 28 179 500086928454053998899350454829680005 36 27 178 79541041261116317571361116214014597 35 27 177 76040263911886881018868811936204067 35 27 176 74533508669315689498651396680533547 35 27 175 67253277379351382128315397377235276 35 27 174 54665114627238004940083272641156645 35 27 173 41577374647642239193224674647377514 35 27 172 39444498341232810101823214389444493 35 27 171 39116226249037514941573094262261193 35 27 170 21387418959671881118817695981478312 35 26 169 8982361345750321111230575431632898 34 26 168 8777523535900540110450095353257778 34 26 167 8428544259613979669793169524458248 34 26 166 8049977444188255115528814447799408 34 26 165 6293013903284550440554823093103926 34 26 164 2996770679757587557857579760776992 34 26 163 2897965724610445665440164275697982 34 26 162 775523787915225656522519787325577 33 25 161 731774259192510010015291952477137 33 25 160 614099042684328494823486240990416 33 25 159 611006272948700040007849272600116 33 25 158 588537831101694727496101138735885 33 25 157 554798610057829404928750016897455 33 25 156 516237067149594111495941760732615 33 25 155 514992356140438343834041653299415 33 25 154 355221077048407838704840770122553 33 25 153 276881367124214616412421763188672 33 25 152 237821085979590535095979580128732 33 25 151 219131491078052666250870194131912 33 25 150 203073339695559252955596933370302 33 25 149 198004771432239525932234177400891 33 25 148 194687324144599454995441423786491 33 25 147 26876112880251744715208821167862 32 24 146 26260393072525766752527039306262 32 24 145 24808975837313377331373857980842 32 24 144 2249807081855747475581807089422 31 23 143 2173846011106066606011106483712 31 23 142 2112941524766312136674251492112 31 23 141 2015058419592656562959148505102 31 23 140 914255634405986689504436552419 30 23 139 904509707950454454059707905409 30 23 138 838524395835168861538593425838 30 23 137 639496904255176671552409694936 30 23 136 505620179066894498660971026505 30 23 135 82445540755199199155704554428 29 22 134 42868110518707270781501186824 29 22 133 41579611610804640801611697514 29 22 132 8111246402572112752046421118 28 22 131 3695929001667557661009295963 28 21 130 3672400560982112890650042763 28 21 129 2220211336283333826331120222 28 21 128 1830150186588338856810510381 28 21 127 87756287697722779678265778 26 20 126 63490001972122127910009436 26 20 125 29868615782144128751686892 26 20 124 8568829857980897589288658 25 19 123 6383356215839385126533836 25 19 122 6218321959740479591238126 25 19 121 6092540204984894020452906 25 19 120 5940736656731376566370495 25 19 119 2378370006742476000738732 25 19 118 604543026982289620345406 24 18 117 479944134267762431449974 24 18 116 446543480077770084345644 24 18 115 442151455867768554151244 24 18 114 435985642768867246589534 24 18 113 272904296757757692409272 24 18 112 230868059222222950868032 24 18 111 44008428665656682480044 23 18 110 40429968842924886992404 23 18 109 28462178542224587126482 23 17 108 22107920297579202970122 23 17 107 8022872169779612782208 22 17 106 2661106041551406011662 22 17 105 54022659711795622045 20 15 104 53479116322361197435 20 15 103 52695119366391159625 20 15 102 32056623722732665023 20 15 101 28130792022029703182 20 15 100 4889312521252139884 19 15 99 2969386212126839692 19 14 98 2745161405041615472 19 14 97 2407431827281347042 19 14 96 2242598563658952422 19 14 95 881866612216668188 18 14 94 478303605506303874 18 14 93 99703025352030799 17 13 92 92613604440631629 17 13 91 82993441914439928 17 13 90 Prime!    78357734643775387 17 13 89 49126258185262194 17 13 88 44506740304760544 17 13 87 39823252625232893 17 13 86 38275424142457283 17 13 85 37022794049722073 17 13 84 32924868186842923 17 13 83 28590052425009582 17 13 82 23530366466303532 17 13 81 13894950405949831 17 13 80 10091495959419001 17 13 79 8628788338878268 16 13 78 6388598118958836 16 12 77 6116292442926116 16 12 76 4690638558360964 16 12 75 2369324774239632 16 12 74 2277486006847722 16 12 73 881910212019188 15 12 72 338734909437833 15 11 71 289911959119982 15 11 70 235023626320532 15 11 69 217306686603712 15 11 68 207449545944702 15 11 67 128197515791821 15 11 66 90660677606609 14 11 65 59139544593195 14 11 64 27210988901272 14 11 63 8816817186188 13 10 62 2596329236952 13 10 61 440827728044 12 9 60 303880088303 12 9 59 98157575189 11 9 58 79375957397 11 9 57 66969496966 11 9 56 54482928445 11 9 55 8087337808 10 8 54 6801661086 10 8 53 4672002764 10 8 52 4475555744 10 8 51 2130880312 10 8 50 1696776961 10 7 49 1418668141 10 7 48 1378448731 10 7 47 900535009 9 7 46 620282026 9 7 45 490222094 9 7 44 427020724 9 7 43 423484324 9 7 42 409161904 9 7 41 340373043 9 7 40 293080392 9 7 39 68933986 8 6 38 67222276 8 6 37 66988966 8 6 36 46422464 8 6 35 28355382 8 6 34 25622652 8 6 33 6612166 7 6 32 6563656 7 6 31 6233326 7 6 30 3979793 7 5 29 3735373 7 5 28 3710173 7 5 27 2379732 7 5 26 1844481 7 5 25 845548 6 5 24 672276 6 5 23 203302 6 5 22 87978 5 4 21 61116 5 4 20 989 3 3 19 Prime!    757 3 3 18 505 3 3 17 484 3 3 16 242 3 2 15 88 2 2 14 66 2 2 13 44 2 2 12 22 2 2 11 Prime!    11 2 1 10 9 1 1 9 8 1 1 8 Prime!    7 1 1 7 6 1 1 6 Prime!    5 1 1 5 4 1 1 4 Prime!    3 1 1 3 Prime!    2 1 1 2 1 1 1 1 0 1 1	Index Nr Also palindromic in base 22 L base 10 L base 22 Next > 10^40 161 9819189941882503148888413052881499819189 40 30 160 9550179201780696839119386960871029710559 40 30 159 9412498092868370772332770738682908942149 40 30 158 809415948029245195242591542920849514908 39 29 157 738548765180084010191010480081567845837 39 29 156 626163762473448952323259844374267361626 39 29 155 599906608932474754121457474239806609995 39 29 154 522446535582747454909454747285535644225 39 29 153 491688430749193489888984391947034886194 39 29 152 269025202228017163060361710822202520962 39 29 151 1831480353173843497943483713530841381 37 28 150 1527561937551511249421151557391657251 37 27 149 944012103855119341143911558301210449 36 27 148 933625977299672186681276992779526339 36 27 147 922207979389658480084856983979702229 36 27 146 920124358035117766667711530853421029 36 27 145 916441772431358349943853134277144619 36 27 144 93085199396651622022615669399158039 35 27 143 91230105388221476067412288350103219 35 27 142 66224829052349513731594325092842266 35 26 141 56508642878370552925507387824680565 35 26 140 50056932747566532123566574723965005 35 26 139 33775796288042398589324088269757733 35 26 138 33771693088341412321414388039617733 35 26 137 24234965759655471817455695756943242 35 26 136 23351862003683300300338630026815332 35 26 135 12131062238617574647571683226013121 35 26 134 1941670980296449449446920890761491 34 25 133 1924007804384835885384834087004291 34 25 132 1915318137662612112162667318135191 34 25 131 1914634799329233113329239974364191 34 25 130 1886378269236075995706329628736881 34 25 129 957080143061265595562160341080759 33 25 128 948894412395793656397593214498849 33 25 127 912138514086968727869680415831219 33 25 126 689583825099946505649990528385986 33 25 125 578253811723787010787327118352875 33 25 124 509650746242009191900242647056905 33 25 123 464368435067696525696760534863464 33 25 122 410588482149393676393941284885014 33 25 121 319819868802646181646208868918913 33 25 120 318118667764117868711467766811813 33 25 119 316563149933942404249339941365613 33 25 118 Prime!    194199296854636090636458692991491 33 25 117 182958834325479797974523438859281 33 25 116 180704723148675010576841327407081 33 25 115 7286458386580964690856838546827 31 23 114 6888124722973366633792274218886 31 23 113 6361035477051399931507745301636 31 23 112 6167158766292447442926678517616 31 23 111 5264986368806922296088636894625 31 23 110 5134909184679042409764819094315 31 23 109 4791708901510883880151098071974 31 23 108 4791463151864995994681513641974 31 23 107 4335721037506991996057301275334 31 23 106 3910144715663339333665174410193 31 23 105 3180415690946329236490965140813 31 23 104 2929965234808031308084325699292 31 23 103 2129027573904457544093757209212 31 23 102 1795291501234740474321051925971 31 23 101 15490853432526862523435809451 29 21 100 15367626759765956795762676351 29 21 99 11099342670170707107624399011 29 21 98 10935992681396869318629953901 29 21 97 7996519662054224502669156997 28 21 96 7855101497900990097941015587 28 21 95 929119206731949137602911929 27 21 94 735527938200353002839725537 27 21 93 607006644567070765446600706 27 20 92 412878070113040311070878214 27 20 91 16818272485188158427281861 26 19 90 6871111435849485341111786 25 19 89 6861495581103011855941686 25 19 88 6484533688042408863354846 25 19 87 6448106435544455346018446 25 19 86 6047673921145411293767406 25 19 85 5002731504042404051372005 25 19 84 732847748373373847748237 24 18 83 61122087636163678022116 23 17 82 43098031828782813089034 23 17 81 34003181203430218130043 23 17 80 17181371141614117318171 23 17 79 16551619802120891615561 23 17 78 11323518765456781532311 23 17 77 11287904855055840978211 23 17 76 1639405899779985049361 22 16 75 1583379142222419733851 22 16 74 1568265908888095628651 22 16 73 708258665707566852807 21 16 72 74312996511569921347 20 15 71 72673811666611837627 20 15 70 72413971722717931427 20 15 69 72099151411415199027 20 15 68 71670186944968107617 20 15 67 7260302291922030627 19 15 66 150917442244719051 18 13 65 142054031130450241 18 13 64 95881569296518859 17 13 63 93895494749459839 17 13 62 90814147874141809 17 13 61 89233276667233298 17 13 60 89079044444097098 17 13 59 83218001210081238 17 13 58 75144757675744157 17 13 57 71360959395906317 17 13 56 19291952825919291 17 13 55 17467113931176471 17 13 54 574128141821475 15 11 53 573859747958375 15 11 52 567425595524765 15 11 51 495172868271594 15 11 50 276695727596672 15 11 49 232474888474232 15 11 48 145410535014541 15 11 47 100357979753001 15 11 46 1963232323691 13 10 45 1389924299831 13 10 44 1162319132611 13 9 43 93648984639 11 9 42 77263836277 11 9 41 77185658177 11 9 40 Prime!    75293639257 11 9 39 18486568481 11 8 38 1297007921 10 7 37 1285665821 10 7 36 575595575 9 7 35 575232575 9 7 34 472181274 9 7 33 399080993 9 7 32 133727331 9 7 31 59155195 8 6 30 5109015 7 5 29 5048405 7 5 28 2968692 7 5 27 2846482 7 5 26 2408042 7 5 25 2359532 7 5 24 79097 5 4 23 76567 5 4 22 28382 5 4 21 25852 5 4 20 5775 4 3 19 5665 4 3 18 5555 4 3 17 5445 4 3 16 5335 4 3 15 Prime!    727 3 3 14 595 3 3 13 414 3 2 12 161 3 2 11 Prime!    11 2 1 10 9 1 1 9 8 1 1 8 Prime!    7 1 1 7 6 1 1 6 Prime!    5 1 1 5 4 1 1 4 Prime!    3 1 1 3 Prime!    2 1 1 2 1 1 1 1 0 1 1
Index Nr Also palindromic in base 23 L base 10 L base 23 Next > 10^40 147 2783813221151041495555941401511223183872 40 29 146 2773055422601392257887522931062245503772 40 29 145 1838398129678853992662993588769218938381 40 29 144 1184847698619436000220006349168967484811 40 29 143 975850637806367008727800763608736058579 39 29 142 939084419503292532323235292305914480939 39 29 141 645227674285629116797611926582476722546 39 29 140 350751985338412470060074214833589157053 39 29 139 239851296092368942090249863290692158932 39 29 138 61883461917164543400434546171916438816 38 28 137 5743694577206574048404756027754963475 37 27 136 4838887299264830138310384629927888384 37 27 135 4741120156646535966695356466510211474 37 27 134 4675157173652155944495512563717515764 37 27 133 3848419424338201479741028334249148483 37 27 132 3703163098647513052503157468903613073 37 27 131 1759254359507356741476537059534529571 37 27 130 1378130681006677552557766001860318731 37 27 129 803212011182807456654708281110212308 36 27 128 29754620123259314541395232102645792 35 26 127 10839226072242778487724227062293801 35 25 126 9979116049243405225043429406119799 34 25 125 928559984775688595886577489955829 33 25 124 914785028408082565280804820587419 33 25 123 848528000078283505382870000825848 33 25 122 716783482198630080036891284387617 33 25 121 715875694620965404569026496578517 33 25 120 556198355161430535034161553891655 33 25 119 445813553679501171105976355318544 33 24 118 257717366593260636062395663717752 33 24 117 18034556149938822883994165543081 32 23 116 14180837152029777792025173808141 32 23 115 9742282854886133316884582822479 31 23 114 9410374616482850582846164730149 31 23 113 9162342620944884884490262432619 31 23 112 7856553281143055503411823556587 31 23 111 7193713481217949497121843173917 31 23 110 4302846165460433340645616482034 31 23 109 3114304846142263622416484034113 31 23 108 31704814826289898262841840713 29 21 107 31553107123664046632170135513 29 21 106 30026952755157475155725962003 29 21 105 29951812418993539981421815992 29 21 104 25892199516160406161599129852 29 21 103 24962406626326462362660426942 29 21 102 22323256915661316651965232322 29 21 101 18181018630249994203681018181 29 21 100 16834595968848784886959543861 29 21 99 14227453643377377334635472241 29 21 98 13083930168525052586103938031 29 21 97 58463897549488494579836485 26 19 96 57028113435899853431182075 26 19 95 31493590722299222709539413 26 19 94 30223998636011063689932203 26 19 93 9996743369923299633476999 25 19 92 6384673549076709453764836 25 19 91 4593843282500052823483954 25 19 90 2761247407410147047421672 25 18 89 98374186275157268147389 23 17 88 95419692339993329691459 23 17 87 55892207883438870229855 23 17 86 55023258271317285232055 23 17 85 54631320295159202313645 23 17 84 45922333757875733322954 23 17 83 29211137779297773111292 23 17 82 27939766686368666793972 23 17 81 16772477809490877427761 23 17 80 10813412938683921431801 23 17 79 825805096505690508528 21 16 78 243571272909272175342 21 15 77 118656469858964656811 21 15 76 110277674151476772011 21 15 75 8210665697965660128 19 14 74 4816500789870056184 19 14 73 4283464631364643824 19 14 72 487917888888719784 18 13 71 306274366663472603 18 13 70 87947524442574978 17 13 69 81157437573475118 17 13 68 75427181318172457 17 13 67 30110838583801103 17 13 66 870451686154078 15 11 65 854161737161458 15 11 64 771958868859177 15 11 63 743564333465347 15 11 62 743067525760347 15 11 61 595175959571595 15 11 60 583400171004385 15 11 59 567110222011765 15 11 58 439321919123934 15 11 57 274078272870472 15 11 56 156776767677651 15 11 55 144645535546441 15 11 54 144148727841441 15 11 53 59568111186595 14 11 52 8463508053648 13 10 51 1759179719571 13 9 50 1724384834271 13 9 49 1372149412731 13 9 48 881274472188 12 9 47 830493394038 12 9 46 676421124676 12 9 45 638980089836 12 9 44 625640046526 12 9 43 317227722713 12 9 42 63522022536 11 8 41 61029992016 11 8 40 46405150464 11 8 39 3181771813 10 7 38 2266116622 10 7 37 965585569 9 7 36 949969949 9 7 35 843636348 9 7 34 282565282 9 7 33 254040452 9 7 32 199757991 9 7 31 6307036 7 5 30 5836385 7 5 29 5116115 7 5 28 4645464 7 5 27 4151514 7 5 26 3454543 7 5 25 1911191 7 5 24 1049401 7 5 23 88488 5 4 22 84048 5 4 21 65256 5 4 20 42024 5 4 19 6336 4 3 18 5115 4 3 17 3663 4 3 16 2442 4 3 15 1221 4 3 14 898 3 3 13 737 3 3 12 22 2 1 11 Prime!    11 2 1 10 9 1 1 9 8 1 1 8 Prime!    7 1 1 7 6 1 1 6 Prime!    5 1 1 5 4 1 1 4 Prime!    3 1 1 3 Prime!    2 1 1 2 1 1 1 1 0 1 1	Index Nr Also palindromic in base 24 A250409 L base 10 L base 24 Next > 10^40 173 9620280823785621796226971265873280820269 40 29 172 8105050367697012413773142107967630505018 40 29 171 8103917806388616247557426168836087193018 40 29 170 7562498229787438797447978347879228942657 40 29 169 7528751229655133341661433315569221578257 40 29 168 4516645234478258235555328528744325466154 40 29 167 2688655175374362009009002634735715568862 40 29 166 1752661427041315035335305131407241662571 40 29 165 1736515410473024959559594203740145156371 40 29 164 10354958024133644277244633142085945301 38 27 163 8331766369985002897982005899636671338 37 27 162 8129696303685614734374165863036969218 37 27 161 6793833140413087821287803140413383976 37 27 160 6581422999518603166613068159992241856 37 27 159 6542905687555049468649405557865092456 37 27 158 2026955645761869444449681675465596202 37 27 157 30926608891576324642367519880662903 35 25 156 30922009995454161816145459990022903 35 25 155 30903810792505641214650529701830903 35 25 154 24683434086876873637867868043438642 35 25 153 24425722377037911011973077322752442 35 25 152 24267986248298613331689284268976242 35 25 151 18318239323495970607959432393281381 35 25 150 12391139543577315651377534593119321 35 25 149 8978276108079019889109708016728798 34 25 148 7176648563267884994887623658466717 34 25 147 528095667133627121726331766590825 33 24 146 53970061629801255210892616007935 32 23 145 41788153958305444450385935188714 32 23 144 39946418853603522530635881464993 32 23 143 34750790472271266217227409705743 32 23 142 17668568137478033087473186586671 32 23 141 12635645261960899806916254653621 32 23 140 9166730205878850588785020376619 31 23 139 9166109264546872786454629016619 31 23 138 6681340314953258523594130431866 31 23 137 527344724413210012314427443725 30 22 136 95959991427309890372419995959 29 21 135 95333149645217171254694133359 29 21 134 93820860090491719409006802839 29 21 133 89943384230599899503248334998 29 21 132 67798439089955355998093489776 29 21 131 67140814774707470747741804176 29 21 130 65667330599283138299503376656 29 21 129 54471793440915151904439717445 29 21 128 52966244482139693128444266925 29 21 127 48806811197453835479111860884 29 21 126 43808659619518881591695680834 29 21 125 41304313740776067704731340314 29 21 124 26621349082992929928094312662 29 21 123 24758778014539193541087785742 29 21 122 13797218632245654223681279731 29 21 121 8901573125919119195213751098 28 21 120 578379706633898336607973875 27 20 119 135021991807353708199120531 27 19 118 125623664514686415466326521 27 19 117 92457915335366353351975429 26 19 116 88548947001722710074984588 26 19 115 78306968117055071186960387 26 19 114 9480571413533353141750849 25 19 113 5726393288270728823936275 25 18 112 5705961553567653551695075 25 18 111 5705508594989894958055075 25 18 110 526970030147741030079625 24 18 109 223610367513315763016322 24 17 108 Prime!    95528099096969099082559 23 17 107 71300029594649592000317 23 17 106 14477990660906609977441 23 17 105 5720472238008322740275 22 16 104 225048179525971840522 21 15 103 86812504855840521868 20 15 102 47620992166129902674 20 15 101 39763873222237836793 20 15 100 33847674500547674833 20 15 99 5219957301037599125 19 14 98 834291782287192438 18 13 97 830868275572868038 18 13 96 705673961169376507 18 13 95 689870646646078986 18 13 94 500807240042708005 18 13 93 351531099990135153 18 13 92 334935786687539433 18 13 91 56257511911575265 17 13 90 Prime!    37872782328727873 17 13 89 1081605445061801 16 11 88 978898787898879 15 11 87 974909929909479 15 11 86 972363696363279 15 11 85 893872555278398 15 11 84 893859050958398 15 11 83 Prime!    726674454476627 15 11 82 720623343326027 15 11 81 709277808772907 15 11 80 668444222444866 15 11 79 649470979074946 15 11 78 649457474754946 15 11 77 379849999948973 15 11 76 352084363480253 15 11 75 296430484034692 15 11 74 294823767328492 15 11 73 279033838330972 15 11 72 273593222395372 15 11 71 108971474179801 15 11 70 106395121593601 15 11 69 100344010443001 15 11 68 5223359533225 13 10 67 2084684864802 13 9 66 2084226224802 13 9 65 2024272724202 13 9 64 1490461640941 13 9 63 1318742478131 13 9 62 1047699967401 13 9 61 1042342432401 13 9 60 780089980087 12 9 59 686286682686 12 9 58 240745547042 12 9 57 129797797921 12 9 56 125825528521 12 9 55 3032112303 10 7 54 2315115132 10 7 53 1516776151 10 7 52 1039669301 10 7 51 981050189 9 7 50 866333668 9 7 49 760313067 9 7 48 728434827 9 7 47 491979194 9 7 46 459020954 9 7 45 417767714 9 7 44 353000353 9 7 43 311747113 9 7 42 Prime!    7865687 7 5 41 7658567 7 5 40 7192917 7 5 39 7132317 7 5 38 6747476 7 5 37 6281826 7 5 36 6014106 7 5 35 5836385 7 5 34 5103015 7 5 33 4925294 7 5 32 4296924 7 5 31 4029204 7 5 30 Prime!    3673763 7 5 29 3118113 7 5 28 2762672 7 5 27 2267622 7 5 26 2207022 7 5 25 Prime!    1851581 7 5 24 374473 6 5 23 13631 5 3 22 12621 5 3 21 11011 5 3 20 10001 5 3 19 8558 4 3 18 6996 4 3 17 6226 4 3 16 4664 4 3 15 2332 4 3 14 575 3 2 13 525 3 2 12 22 2 1 11 Prime!    11 2 1 10 9 1 1 9 8 1 1 8 Prime!    7 1 1 7 6 1 1 6 Prime!    5 1 1 5 4 1 1 4 Prime!    3 1 1 3 Prime!    2 1 1 2 1 1 1 1 0 1 1
Index Nr Also palindromic in base 25 A250410 L base 10 L base 25 Next > 10^40 217 26963344881687381066018378618844336962 38 27 216 26918286634741494533549414743668281962 38 27 215 26912481148740072300327004784118421962 38 27 214 13981353581347097566579074318535318931 38 27 213 13707756003301273188137210330065770731 38 27 212 9270837619832451174711542389167380729 37 27 211 9236976663848018867688108483666796329 37 27 210 8750342335951803228223081595332430578 37 27 209 8289894106158426777776248516014989828 37 27 208 8240957247798625742475268977427590428 37 27 207 84947032631745183338154713623074948 35 25 206 84940162367565527572556576326104948 35 25 205 84940110182329752625792328101104948 35 25 204 84633185470108461016480107458133648 35 25 203 84371473612055340004355021637417348 35 25 202 84327279860291256665219206897272348 35 25 201 84326607884450939793905448870662348 35 25 200 84064444540802017571020804544446048 35 25 199 84014949858689122022198685894941048 35 25 198 84013873762618535353581626737831048 35 25 197 79777637087790502820509778073677797 35 25 196 79726511826442569396524462811562797 35 25 195 56818451099294510801549299015481865 35 25 194 56812154732768652625686723745121865 35 25 193 56556749374240358385304247394765565 35 25 192 56243916698868316061386889661934265 35 25 191 56243916059132183138123195061934265 35 25 190 7749357015822528778252285107539477 34 25 189 6276905249094644334464909425096726 34 25 188 2454286607236231551326327066824542 34 24 187 120734177415734818437514771437021 33 23 186 120734127934375868573439721437021 33 23 185 Prime!    120717112020917888719020211717021 33 23 184 73036380577976700767977508363037 32 23 183 73030078118728688682781187003037 32 23 182 63367206797644233244679760276336 32 23 181 58939399083673922937638099393985 32 23 180 6249245248146522256418425429426 31 23 179 4484597327359500059537237954844 31 22 178 4484544645484025204845464454844 31 22 177 148524472525910019525274425841 30 21 176 147011887284360063482788110741 30 21 175 90606840782101910128704860609 29 21 174 80867182215769896751228176808 29 21 173 80429390754894949845709392408 29 21 172 80429343056179297165034392408 29 21 171 80081081014790309741018018008 29 21 170 80036553291095659019235563008 29 21 169 70689502968520402586920598607 29 21 168 70246593700293739200739564207 29 21 167 60899599324242424242399599806 29 21 166 60894373383485258438337349806 29 21 165 60849324005195059150042394806 29 21 164 60456074852380708325847065406 29 21 163 60063796750869696805769736006 29 21 162 50666579497957075979497566605 29 21 161 50610591984032723048919501605 29 21 160 50279549806345254360894597205 29 21 159 50279032988836463888923097205 29 21 158 45390816776287578267761809354 29 21 157 45345819835436363453891854354 29 21 156 45345814503366366330541854354 29 21 155 40877618140259995204181677804 29 21 154 40826856745895759854765862804 29 21 153 40826396832604440623869362804 29 21 152 40484368472305150327486348404 29 21 151 40483260714058885041706238404 29 21 150 40090470959395359395907409004 29 21 149 35998303845840004854830389953 29 21 148 35942832781773537718723824953 29 21 147 35162505963326362336950526153 29 21 146 35117550804725252740805571153 29 21 145 35117043365823532856334071153 29 21 144 35111795328322322382359711153 29 21 143 30205755011072527011055750203 29 21 142 30200534756858185865743500203 29 21 141 20808594142437173424149580802 29 21 140 20803833628976767982633830802 29 21 139 20466040403254045230404066402 29 21 138 20461843042502320524034816402 29 21 137 20415288433830803833488251402 29 21 136 20022441669154145196614422002 29 21 135 10238753587904840978535783201 29 21 134 8454844315722882275134484548 28 20 133 677644437184535481734446776 27 20 132 624029739729464927937920426 27 20 131 249113625258898852526311942 27 19 130 249102607983484389706201942 27 19 129 168753529508434805925357861 27 19 128 168753057675747576750357861 27 19 127 168293205034484430502392861 27 19 126 168282283918020819382282861 27 19 125 166489208801232108802984661 27 19 124 6884583917538357193854886 25 18 123 449366840061160048663944 24 17 122 318971379669966973179813 24 17 121 311205155290092551502113 24 17 120 97492702369196320729479 23 17 119 82357410525052501475328 23 17 118 82352243437673434225328 23 17 117 567581192010291185765 21 15 116 567523446969644325765 21 15 115 567086518727815680765 21 15 114 561386641979146683165 21 15 113 561381142989241183165 21 15 112 333497209646902794333 21 15 111 333439037414730934333 21 15 110 330392226292622293033 21 15 109 330386922292229683033 21 15 108 330339553050355933033 21 15 107 330334054060450433033 21 15 106 289730644898446037982 21 15 105 289230133515331032982 21 15 104 286135110959011531682 21 15 103 283598304626403895382 21 15 102 283593896101698395382 21 15 101 283541449393944145382 21 15 100 280941958494859149082 21 15 99 280493374555473394082 21 15 98 280435676525676534082 21 15 97 280430218757812034082 21 15 96 77606803722730860677 20 15 95 62581772266227718526 20 15 94 Prime!    1272787016107872721 19 13 93 Prime!    1272398751578932721 19 13 92 Prime!    1272394497944932721 19 13 91 1262866576756682621 19 13 90 1262694643464962621 19 13 89 1262690389830962621 19 13 88 Prime!    1262585225225852621 19 13 87 1262196960696912621 19 13 86 Prime!    1262196953596912621 19 13 85 1252998152518992521 19 13 84 1252990535350992521 19 13 83 1252881117111882521 19 13 82 689560096690065986 18 13 81 109981264462189901 18 13 80 62005276067250026 17 13 79 8251018778101528 16 12 78 1134114554114311 16 11 77 858118262811858 15 11 76 854207131702458 15 11 75 659953777359956 15 11 74 606970919079606 15 11 73 507756707657705 15 11 72 404662313266404 15 11 71 404615656516404 15 11 70 400704525407004 15 11 69 309318434813903 15 11 68 259756919657952 15 11 67 255881999188552 15 11 66 255839929938552 15 11 65 251970868079152 15 11 64 206784282487602 15 11 63 206224040422602 15 11 62 202867292768202 15 11 61 202307050703202 15 11 60 156662525266651 15 11 59 89954955945998 14 10 58 89331400413398 14 10 57 61986277268916 14 10 56 28023488432082 14 10 55 1678753578761 13 9 54 Prime!    1678699968761 13 9 53 1678690968761 13 9 52 83895259838 11 8 51 83849694838 11 8 50 874868478 9 7 49 874383478 9 7 48 827777728 9 7 47 223454322 9 6 46 85400458 8 6 45 9498949 7 5 44 Prime!    9493949 7 5 43 9467649 7 5 42 9462649 7 5 41 9436349 7 5 40 9431349 7 5 39 9405049 7 5 38 Prime!    9400049 7 5 37 8986898 7 5 36 6639366 7 5 35 6634366 7 5 34 6608066 7 5 33 6603066 7 5 32 3397933 7 5 31 Prime!    3392933 7 5 30 3366633 7 5 29 3361633 7 5 28 3335333 7 5 27 3330333 7 5 26 3309033 7 5 25 Prime!    3304033 7 5 24 2859582 7 5 23 2828282 7 5 22 626626 6 5 21 622226 6 5 20 9339 4 3 19 8338 4 3 18 7887 4 3 17 6886 4 3 16 1001 4 3 15 676 3 3 14 626 3 3 13 494 3 2 12 22 2 1 11 Prime!    11 2 1 10 9 1 1 9 8 1 1 8 Prime!    7 1 1 7 6 1 1 6 Prime!    5 1 1 5 4 1 1 4 Prime!    3 1 1 3 Prime!    2 1 1 2 1 1 1 1 0 1 1	Index Nr Also palindromic in base 26 L base 10 L base 26 Next > 10^40 158 7875282055041233421661243321405502825787 40 29 157 5227785756625619609449069165266575877225 40 29 156 524325946269467388111883764962649523425 39 28 155 404067596378398703272307893873695760404 39 28 154 157588652095091578525875190590256885751 39 27 153 155732575124532093010390235421575237551 39 27 152 96980047285716195111159161758274008969 38 27 151 9651448858566746416146476658588441569 37 27 150 Prime!    9031602789156179792979716519872061309 37 27 149 197529809632712516615217236908925791 36 25 148 178700427995440323323044599724007871 36 25 147 177450410663037756657730366014054771 36 25 146 71220494289739203130293798249402217 35 25 145 53200542009066925752966090024500235 35 25 144 41984555052421334943312425055548914 35 25 143 12959000839996297779269993800095921 35 25 142 343862957609377505773906759268343 33 23 141 317766184282992212299282481667713 33 23 140 315973116839552575255938611379513 33 23 139 225447758179637494736971857744522 33 23 138 157810368069731606137960863018751 33 23 137 89123681143146711764134118632198 32 23 136 64142640148947199174984104624146 32 23 135 18783496684823400432848669438781 32 23 134 13343991448010222201084419934331 32 22 133 553483224501363363105422384355 30 22 132 448843589990805508099985348844 30 21 131 197690880360372273063088096791 30 21 130 48787398562478087426589378784 29 21 129 41474398802255855220889347414 29 21 128 33820772648340604384627702833 29 21 127 756041032046777640230140657 27 19 126 755543628018171810826345557 27 19 125 745437289662575266982734547 27 19 124 671134758673929376857431176 27 19 123 572560097244090442790065275 27 19 122 491505444072484270444505194 27 19 121 488262189068616860981262884 27 19 120 421359130252292252031953124 27 19 119 166273820380010083028372661 27 19 118 166256758117040711857652661 27 19 117 161061729629323926927160161 27 19 116 111288661827080728166882111 27 19 115 103721848049000940848127301 27 19 114 94267043881277218834076249 26 19 113 64552118631944913681125546 26 19 112 10238227806699660872283201 26 18 111 925868816891198618868529 24 17 110 445107938864468839701544 24 17 109 317206734667766437602713 24 17 108 209688527565565725886902 24 17 107 77942155641414655124977 23 17 106 27112769944444996721172 23 16 105 1530612151111512160351 22 15 104 738415822151228514837 21 15 103 732212030828030212237 21 15 102 718816455111554618817 21 15 101 673029633565336920376 21 15 100 673022397323793220376 21 15 99 646007072020270700646 21 15 98 593237384292483732395 21 15 97 512286311111113682215 21 15 96 503721501585105127305 21 15 95 414149984828489941414 21 15 94 405124140838041421504 21 15 93 374061759010957160473 21 15 92 354469628212826964453 21 15 91 259290234191432092952 21 15 90 93028124222242182039 20 15 89 9767283178713827679 19 14 88 6996005035305006996 19 14 87 2334617912197164332 19 13 86 2162340330330432612 19 13 85 1897787568657877981 19 13 84 1139080380830809311 19 13 83 1056500659560056501 19 13 82 739608723327806937 18 13 81 95118076767081159 17 12 80 89973287278237998 17 12 79 3603830770383063 16 11 78 3603500110053063 16 11 77 3555977887795553 16 11 76 3555647227465553 16 11 75 1364785115874631 16 11 74 1009338558339001 16 11 73 889700474007988 15 11 72 889266565662988 15 11 71 873216272612378 15 11 70 738793101397837 15 11 69 722274868472227 15 11 68 612500656005216 15 11 67 520743626347025 15 11 66 512326979623215 15 11 65 420569949965024 15 11 64 179877909778971 15 11 63 106018868810601 15 10 62 103472686274301 15 10 61 92424066042429 14 10 60 5404902094045 13 9 59 5223922293225 13 9 58 4726136316274 13 9 57 4190117110914 13 9 56 3693694963963 13 9 55 3662197912663 13 9 54 Prime!    3610437340163 13 9 53 3335051505333 13 9 52 3193401043913 13 9 51 3146469646413 13 9 50 2183758573812 13 9 49 2149753579412 13 9 48 1181201021811 13 9 47 1134269624311 13 9 46 185076670581 12 8 45 72728282727 11 8 44 30966666903 11 8 43 6825225286 10 7 42 4417777144 10 7 41 2069559602 10 7 40 933242339 9 7 39 643090346 9 7 38 626262626 9 7 37 321131123 9 7 36 Prime!    319282913 9 7 35 238010832 9 6 34 218050812 9 6 33 134515431 9 6 32 9823289 7 5 31 9679769 7 5 30 8285828 7 5 29 7924297 7 5 28 6530356 7 5 27 5048405 7 5 26 4631364 7 5 25 1387831 7 5 24 84348 5 4 23 49194 5 4 22 18981 5 4 21 Prime!    17471 5 3 20 14841 5 3 19 Prime!    13331 5 3 18 10701 5 3 17 9009 4 3 16 8228 4 3 15 7447 4 3 14 4114 4 3 13 989 3 3 12 22 2 1 11 Prime!    11 2 1 10 9 1 1 9 8 1 1 8 Prime!    7 1 1 7 6 1 1 6 Prime!    5 1 1 5 4 1 1 4 Prime!    3 1 1 3 Prime!    2 1 1 2 1 1 1 1 0 1 1
Index Nr Also palindromic in base 27 A250411 L base 10 L base 27 Next > 10^40 167 6355998462989294720880274929892648995536 40 28 166 395827462414838814606418838414264728593 39 27 165 386666132385892294444492298583231666683 39 27 164 383265806172016142343241610271608562383 39 27 163 332913509857918981171189819758905319233 39 27 162 280639982162055172414271550261289936082 39 27 161 256663504510534717262717435015405366652 39 27 160 226641556028502163353361205820655146622 39 27 159 222577826097665297090792566790628775222 39 27 158 176398557279817752676257718972755893671 39 27 157 175982856145907833161338709541658289571 39 27 156 163772118047068307101703860740811277361 39 27 155 113068478736838050606050838637874860311 39 27 154 107988715764781711757117187467517889701 39 27 153 74583678716146397455479364161787638547 38 27 152 67345675495266952644625966259457654376 38 27 151 48076186794864009400490046849768167084 38 27 150 602153892086476378873674680298351206 36 25 149 376783390565948663366849565093387673 36 25 148 235532079932223560065322239970235532 36 25 147 189112089528966001100669825980211981 36 25 146 97647638086818449694481868083674679 35 25 145 44426405585109416961490158550462444 35 25 144 27603870537658852825885673507830672 35 25 143 21406155574073919491937047555160412 35 24 142 4670358386321237227321236838530764 34 24 141 780987580723929343929327085789087 33 23 140 672258821107252454252701128852276 33 23 139 656227032976644828446679230722656 33 23 138 431744675910509171905019576447134 33 23 137 408106468300596595695003864601804 33 23 136 299767984523300878003325489767992 33 23 135 223358812422880656088224218853322 33 23 134 189280460611063202360116064082981 33 23 133 155588984137475808574731489885551 33 23 132 83027353415039299293051435372038 32 23 131 27575143052156588565125034157572 32 22 130 6747384413564170714653144837476 31 22 129 4039208702958088808592078029304 31 22 128 1026544977961689861697794456201 31 21 127 887048854471873378174458840788 30 21 126 494057913608053350806319750494 30 21 125 326453310088550055880013354623 30 21 124 98879695394699799649359697889 29 21 123 95872230303232323230303227859 29 21 122 82273967708724142780776937228 29 21 121 73962984614988488941648926937 29 21 120 43065687613305450331678656034 29 21 119 42164024668980508986642046124 29 20 118 27777283502459795420538277772 29 20 117 831518727594434495727815138 27 19 116 703579834254303452438975307 27 19 115 648309341763686367143903846 27 19 114 463491688380535083886194364 27 19 113 398609983818969818389906893 27 19 112 295710359334929433953017592 27 19 111 226437851929787929158734622 27 19 110 164996124019474910421699461 27 19 109 109088505300868003505880901 27 19 108 67376114548255284541167376 26 19 107 6950012081730371802100596 25 18 106 4038117968333338697118304 25 18 105 2073977966078706697793702 25 17 104 1886747161210121617476881 25 17 103 1802160476849486740612081 25 17 102 1798059854180814589508971 25 17 101 1208548428985898248458021 25 17 100 1000238930136310398320001 25 17 99 464397564319913465793464 24 17 98 94261674204140247616249 23 17 97 Prime!    92723610384148301632729 23 17 96 86079962605250626997068 23 17 95 46250977359995377905264 23 16 94 2746983281331823896472 22 15 93 2635233580220853325362 22 15 92 1693404525995254043961 22 15 91 1382730900000090372831 22 15 90 914953225585522359419 21 15 89 827809907060709908728 21 15 88 814161635171536161418 21 15 87 703326187535781623307 21 15 86 696067919323919760696 21 15 85 183041901838109140381 21 15 84 3386694465644966833 19 13 83 3032960836380692303 19 13 82 2988046368636408892 19 13 81 2973882904092883792 19 13 80 2885566902096655882 19 13 79 2800354468644530082 19 13 78 2019923988893299102 19 13 77 Prime!    1975783979793875791 19 13 76 1905991653561995091 19 13 75 1800943129213490081 19 13 74 1653624894984263561 19 13 73 957001143341100759 18 13 72 752009074470900257 18 13 71 475084743347480574 18 13 70 295871648846178592 18 13 69 63240319091304236 17 12 68 3774273333724773 16 11 67 2533880440883352 16 11 66 1276149009416721 16 11 65 987115383511789 15 11 64 963217686712369 15 11 63 872951606159278 15 11 62 824685424586428 15 11 61 570984989489075 15 11 60 6041548451406 13 9 59 6014294924106 13 9 58 5779540459775 13 9 57 5193025203915 13 9 56 5052248422505 13 9 55 4806859586084 13 9 54 4725972795274 13 9 53 4520609060254 13 9 52 4446399936444 13 9 51 4280234320824 13 9 50 3958336338593 13 9 49 3817559557183 13 9 48 2969036309692 13 9 47 2904768674092 13 9 46 2823881883282 13 9 45 9058338509 10 7 44 8417447148 10 7 43 5364224635 10 7 42 2487997842 10 7 41 2132882312 10 7 40 836040638 9 7 39 609808906 9 7 38 214171412 9 6 37 67166176 8 6 36 9827289 7 5 35 9466649 7 5 34 9392939 7 5 33 8737378 7 5 32 8663668 7 5 31 7573757 7 5 30 7368637 7 5 29 6639366 7 5 28 6278726 7 5 27 5549455 7 5 26 5475745 7 5 25 4385834 7 5 24 2287822 7 5 23 1197911 7 5 22 65856 5 4 21 17871 5 3 20 15951 5 3 19 13031 5 3 18 Prime!    10301 5 3 17 Prime!    919 3 3 16 838 3 3 15 Prime!    757 3 3 14 616 3 2 13 252 3 2 12 22 2 1 11 Prime!    11 2 1 10 9 1 1 9 8 1 1 8 Prime!    7 1 1 7 6 1 1 6 Prime!    5 1 1 5 4 1 1 4 Prime!    3 1 1 3 Prime!    2 1 1 2 1 1 1 1 0 1 1	Index Nr Also palindromic in base 28 L base 10 L base 28 Next > 10^40 151 991220639372585982444289585273936022199 39 27 150 975224279947509016676610905749972422579 39 27 149 908537311710577126555621775017113735809 39 27 148 623386050206524566242665425602050683326 39 27 147 605886645997503737292737305799546688506 39 27 146 586653070514230428858824032415070356685 39 27 145 438261393401235175000571532104393162834 39 27 144 437128996004960906838609069400699821734 39 27 143 320645460945067599737995760549064546023 39 27 142 262946060207256831919138652702060649262 39 27 141 159766456202050855555558050202654667951 39 27 140 139068555253997418878814799352555860931 39 27 139 134452300022842730565037248220003254431 39 27 138 943492536624571951159175426635294349 36 25 137 697977739508777377773777805937779796 36 25 136 677917425768092020020290867524719776 36 25 135 315333434692258868868852296434333513 36 25 134 311046072443506533335605344270640113 36 25 133 94726605586303586868530368550662749 35 25 132 43680033180008287378280008133008634 35 24 131 23638496426137960006973162469483632 35 24 130 18886360083749103030194738006368881 35 24 129 13979737557414462226441475573797931 35 24 128 869449912072297525792270219944968 33 23 127 869244400790651777156097004442968 33 23 126 826770474190841333148091474077628 33 23 125 768382476060568181865060674283867 33 23 124 476069009529722505227925900960674 33 23 123 414335170809604111406908071533414 33 23 122 205096497091029373920190794690502 33 23 121 129714237335753464357533732417921 33 23 120 79827451987893388339878915472897 32 23 119 61364371162752155125726117346316 32 22 118 9354238895955508055595988324539 31 22 117 2112332547032779772307452332112 31 21 116 1856613814638042408364183166581 31 21 115 1329830874332590952334780389231 31 21 114 144494961477863368774169494441 30 21 113 92270329765133033156792307229 29 21 112 18281041353862326835314018281 29 20 111 16736551460553235506415563761 29 20 110 8142011817728998277181102418 28 20 109 2335223891012772101983225332 28 19 108 1041976567413553147656791401 28 19 107 787884891435070534198488787 27 19 106 566398103473494374301893665 27 19 105 343599652057383750256995343 27 19 104 169908007481616184700809961 27 19 103 Prime!    146689904484929484409986641 27 19 102 102898133661838166331898201 27 18 101 95882547009155190074528859 26 18 100 41760348510333301584306714 26 18 99 3888248367069607638428883 25 17 98 2654716780790970876174562 25 17 97 2010441821286821281440102 25 17 96 2010170679306039760710102 25 17 95 530406187965569781604035 24 17 94 128798027204402720897821 24 16 93 50706795192729159760705 23 16 92 38869249742024794296883 23 16 91 4779717657997567179774 22 15 90 3951289057227509821593 22 15 89 3928714581221854178293 22 15 88 3485892157007512985843 22 15 87 2684904557117554094862 22 15 86 941812559141955218149 21 15 85 885564046818640465588 21 15 84 844248053020350842448 21 15 83 454391757989757193454 21 15 82 186786834434438687681 21 15 81 163121973909379121361 21 14 80 29518742877824781592 20 14 79 19799649566594699791 20 14 78 6242866325236682426 19 13 77 6215457749477545126 19 13 76 4875696356536965784 19 13 75 4380016867686100834 19 13 74 3961949609069491693 19 13 73 3601086475746801063 19 13 72 2988309751579038892 19 13 71 2918489161619848192 19 13 70 1747045084805407471 19 13 69 314435021120534413 18 13 68 20210235053201202 17 12 67 5249970550799425 16 11 66 918395696593819 15 11 65 850128939821058 15 11 64 629596242695926 15 11 63 548785939587845 15 11 62 525408828804525 15 11 61 319102262201913 15 11 60 54173144137145 14 10 59 9693965693969 13 9 58 8338331338338 13 9 57 8332192912338 13 9 56 6385093905836 13 9 55 5788955598875 13 9 54 4699722279964 13 9 53 4120874780214 13 9 52 Prime!    3597871787953 13 9 51 2636029206362 13 9 50 731212212137 12 9 49 396183381693 12 9 48 276220022672 12 8 47 89279097298 11 8 46 79124342197 11 8 45 13363136331 11 7 44 13240004231 11 7 43 11242524211 11 7 42 10549494501 11 7 41 7298118927 10 7 40 6175005716 10 7 39 5760110675 10 7 38 1538668351 10 7 37 Prime!    947141749 9 7 36 904171409 9 7 35 Prime!    773939377 9 7 34 Prime!    751585157 9 7 33 711757117 9 7 32 500595005 9 7 31 427777724 9 6 30 161040161 9 6 29 10499401 8 5 28 Prime!    9324239 7 5 27 8788878 7 5 26 7003007 7 5 25 6601066 7 5 24 6231326 7 5 23 5695965 7 5 22 2972792 7 5 21 20802 5 3 20 16961 5 3 19 15251 5 3 18 10401 5 3 17 6336 4 3 16 5775 4 3 15 696 3 2 14 464 3 2 13 232 3 2 12 22 2 1 11 Prime!    11 2 1 10 9 1 1 9 8 1 1 8 Prime!    7 1 1 7 6 1 1 6 Prime!    5 1 1 5 4 1 1 4 Prime!    3 1 1 3 Prime!    2 1 1 2 1 1 1 1 0 1 1
Index Nr Also palindromic in base 29 L base 10 L base 29 Next > 10^40 152 2093000192363591285335821953632910003902 40 27 151 1821379244348954367227634598434429731281 40 27 150 829122094272567040414040765272490221928 39 27 149 731271174184087628868826780481471172137 39 27 148 670762797860540638515836045068797267076 39 27 147 459997718422049489454984940224817799954 39 27 146 407075728894739535363535937498827570704 39 27 145 234818390070129786000687921070093818432 39 27 144 163359651802486241515142684208156953361 39 27 143 3403616765324197333337914235676163043 37 25 142 3345385244985577264627755894425835433 37 25 141 3260397538838570567650758388357930623 37 25 140 3195660697549303184813039457960665913 37 25 139 2981331968046691044401966408691331892 37 25 138 2658004767073588371738853707674008562 37 25 137 2535566895839392455542939385986655352 37 25 136 2056284552840242862682420482554826502 37 25 135 1531438243783226454546223873428341351 37 25 134 1291601945681769699969671865491061921 37 25 133 1246444635279834694964389725364446421 37 25 132 1202617069888090876780908889607162021 37 25 131 896993151136133736637331631151399698 36 25 130 861849555581580427724085185555948168 36 25 129 634420945040179899998971040549024436 36 25 128 625525871273179886688971372178525526 36 25 127 498437741519974668866479915147734894 36 25 126 2459548246928370000738296428459542 34 23 125 1758983272663716446173662723898571 34 23 124 919170436841508292805148634071919 33 23 123 822586069033428757824330960685228 33 23 122 754751301645536383635546103157457 33 23 121 696996398232282686282232893699696 33 23 120 561595037883063030360388730595165 33 23 119 522326292153174282471351292623225 33 23 118 431660779593962333269395977066134 33 23 117 338597894485435696534584498795833 33 23 116 335335936767065616560767639533533 33 23 115 290871094189936808639981490178092 33 23 114 4217524460619600069160644257124 31 21 113 4092082468741343431478642802904 31 21 112 3989621321274022204721231269893 31 21 111 3633876424354615164534246783363 31 21 110 3337398178434760674348718937333 31 21 109 2954575132154810184512315754592 31 21 108 2639455770433249423340775549362 31 21 107 2498998042603454543062408998942 31 21 106 1830164137302699962037314610381 31 21 105 848471040588598895885040174848 30 21 104 522572177849447744948771275225 30 21 103 489513743720458854027347315984 30 21 102 5068039810040660400189308605 28 19 101 4046997689156446519867996404 28 19 100 2263795460108558010645973622 28 19 99 1468676284482222844826768641 28 19 98 700115383744838447383511007 27 19 97 638380870796565697078083836 27 19 96 413491423523858325324194314 27 19 95 388768153716919617351867883 27 19 94 321087196866333668691780123 27 19 93 257521194202929202491125752 27 19 92 5370904046410146404090735 25 17 91 4909992680668660862999094 25 17 90 2960267391398931937620692 25 17 89 2564084209486849024804652 25 17 88 2063703226239326223073602 25 17 87 1313550753089803570553131 25 17 86 1168253178891988713528611 25 17 85 802637625548845526736208 24 17 84 7625475883773885745267 22 15 83 6482416528228256142846 22 15 82 6202938506006058392026 22 15 81 4220962801221082690224 22 15 80 3231449059669509441323 22 15 79 1517597224444227957151 22 15 78 931138024717420831139 21 15 77 718190061959160091817 21 15 76 699464701212107464996 21 15 75 632554452161254455236 21 15 74 9697997765677997969 19 13 73 8524686215126864258 19 13 72 8371624840484261738 19 13 71 8321104265624011238 19 13 70 6552920373730292556 19 13 69 6429956023206599246 19 13 68 4403998032308993044 19 13 67 3624609808089064263 19 13 66 3351297118117921533 19 13 65 1818308821288038181 19 13 64 760804929929408067 18 13 63 Prime!    11696809290869611 17 11 62 7423932992393247 16 11 61 5268469009648625 16 11 60 2658767997678562 16 11 59 12102077020121 14 9 58 9852537352589 13 9 57 8991895981998 13 9 56 8939482849398 13 9 55 8775005005778 13 9 54 8511759571158 13 9 53 8361888881638 13 9 52 7696190916967 13 9 51 Prime!    7066183816607 13 9 50 7040427240407 13 9 49 6975552555796 13 9 48 6127372737216 13 9 47 5634774774365 13 9 46 5060470740605 13 9 45 4870236320784 13 9 44 4240229220424 13 9 43 4022056502204 13 9 42 Prime!    3957181817593 13 9 41 3301418141033 13 9 40 Prime!    3000234320003 13 9 39 2440776770442 13 9 38 Prime!    1145071705411 13 9 37 15865056851 11 7 36 15700600751 11 7 35 14914241941 11 7 34 14698289641 11 7 33 14533833541 11 7 32 5983223895 10 7 31 5255225525 10 7 30 4771771774 10 7 29 4043773404 10 7 28 693252396 9 7 27 9911199 7 5 26 9537359 7 5 25 8525258 7 5 24 Prime!    7958597 7 5 23 7139317 7 5 22 7078707 7 5 21 6233326 7 5 20 6172716 7 5 19 5160615 7 5 18 4654564 7 5 17 4593954 7 5 16 3581853 7 5 15 19191 5 3 14 1771 4 3 13 Prime!    929 3 3 12 22 2 1 11 Prime!    11 2 1 10 9 1 1 9 8 1 1 8 Prime!    7 1 1 7 6 1 1 6 Prime!    5 1 1 5 4 1 1 4 Prime!    3 1 1 3 Prime!    2 1 1 2 1 1 1 1 0 1 1	Index Nr Also palindromic in base 30 L base 10 L base 30 Next > 10^40 155 7000259036810299775775779920186309520007 40 27 154 6678073151565692152332512965651513708766 40 27 153 3545679831646065914664195606461389765453 40 27 152 3487476302680786531441356870862036747843 40 27 151 12694378858774242477424247785887349621 38 26 150 8132090908300753008003570038090902318 37 25 149 8126161416888779682869778886141616218 37 25 148 8064630010127775457545777210100364608 37 25 147 7901223426061859681869581606243221097 37 25 146 7833762247029939036309399207422673387 37 25 145 7775423619222749728279472229163245777 37 25 144 7775317712575410521250145752177135777 37 25 143 7772372056274020642460204726502732777 37 25 142 4210703098534165513155614358903070124 37 25 141 4146332393599079934399709953932336414 37 25 140 3924233612433043643463403342163324293 37 25 139 3921287984683661399931663864897821293 37 25 138 3850461147391997734377991937411640583 37 25 137 84370525204853329692335840252507348 35 24 136 71462275739807285958270893757226417 35 24 135 63133413740327796369772304731433136 35 24 134 61993539461879954545997816493539916 35 24 133 55098095353397623632679335359089055 35 24 132 53944303010054833333845001030344935 35 24 131 53764460992368949694986329906446735 35 24 130 45806915167474531813547476151960854 35 24 129 45623524970244900100944207942532654 35 24 128 34053187991821269996212819978135043 35 24 127 32806733625100872927800152633760823 35 24 126 24684125562069701110796026552148642 35 24 125 21148144395681406660418659344184112 35 24 124 9138471982376887997886732891748319 34 23 123 8991268228440433113340448228621998 34 23 122 8988194665148858338588415664918898 34 23 121 8988190749428783663878249470918898 34 23 120 8814371121650165335610561211734188 34 23 119 4662404806723402002043276084042664 34 23 118 236171512594803121308495215171632 33 22 117 232578337580463424364085733875232 33 22 116 121041165460408858804064561140121 33 22 115 115359598052061818160250895953511 33 22 114 97283006159296233269295160038279 32 22 113 78976582727862200226872728567987 32 22 112 78873611112413422431421111637887 32 22 111 66995908826752655625762880959966 32 22 110 5564160915961623261695190614655 31 21 109 5560486040806438346080406840655 31 21 108 5556894451405765675041544986555 31 21 107 5485234245136304036315424325845 31 21 106 5481293062850466640582603921845 31 21 105 5398906077915843485197706098935 31 21 104 4961275573239815189323755721694 31 21 103 4961149111616274726161119411694 31 21 102 4953874221228196918221224783594 31 21 101 4953747769859198919589677473594 31 21 100 137288613941605506149316882731 30 20 99 25194135831717271713853149152 29 20 98 23696381010574347501018369632 29 20 97 14793194432890509823449139741 29 20 96 6565659765188008815679565656 28 19 95 6390493385189669815833940936 28 19 94 6199406868963553698686049916 28 19 93 303939212415464514212939303 27 18 92 150031319118161811913130051 27 18 91 28635798908622680989753682 26 18 90 15328550098344389005582351 26 18 89 8087853523743473253587808 25 17 88 8078662811272721182668708 25 17 87 8078501307033307031058708 25 17 86 7685981727024207271895867 25 17 85 7681440691459541960441867 25 17 84 7676958144864684418596767 25 17 83 7488025461619161645208847 25 17 82 7487829998547458999287847 25 17 81 7483126683883883866213847 25 17 80 7479012684867684862109747 25 17 79 7478968234423244328698747 25 17 78 7377454727405047274547737 25 17 77 7377454721825281274547737 25 17 76 160579158529925851975061 24 16 75 160411726327723627114061 24 16 74 9205668413333148665029 22 15 73 203791161363161197302 21 14 72 213121689986121312 18 12 71 212937009900739212 18 12 70 12602195859120621 17 11 69 509566626665905 15 10 68 487035171530784 15 10 67 239318080813932 15 10 66 238892545298832 15 10 65 14313300331341 14 9 64 Prime!    1201117111021 13 9 63 1201109011021 13 9 62 16004240061 11 7 61 15826462851 11 7 60 15599599551 11 7 59 15583138551 11 7 58 15347274351 11 7 57 2134994312 10 7 56 2127777212 10 7 55 1142992411 10 7 54 637888736 9 6 53 296878692 9 6 52 17433471 8 5 51 3178713 7 5 50 3161613 7 5 49 2402042 7 5 48 2293922 7 5 47 2285822 7 5 46 2277722 7 5 45 2269622 7 5 44 2102012 7 5 43 1501051 7 5 42 1392931 7 5 41 1384831 7 5 40 Prime!    1201021 7 5 39 Prime!    1092901 7 5 38 1084801 7 5 37 735537 6 4 36 20602 5 3 35 20302 5 3 34 20002 5 3 33 19791 5 3 32 19491 5 3 31 19191 5 3 30 18981 5 3 29 Prime!    10601 5 3 28 Prime!    10301 5 3 27 10001 5 3 26 7117 4 3 25 6006 4 3 24 5225 4 3 23 4444 4 3 22 4114 4 3 21 3333 4 3 20 3003 4 3 19 2552 4 3 18 2222 4 3 17 1771 4 3 16 1441 4 3 15 1111 4 3 14 868 3 2 13 434 3 2 12 22 2 1 11 Prime!    11 2 1 10 9 1 1 9 8 1 1 8 Prime!    7 1 1 7 6 1 1 6 Prime!    5 1 1 5 4 1 1 4 Prime!    3 1 1 3 Prime!    2 1 1 2 1 1 1 1 0 1 1
Index Nr Also palindromic in base 31 L base 10 L base 31 Next > 10^40 151 8805888903410090191661910900143098885088 40 27 150 5154370671803314572332754133081760734515 40 27 149 3980061760432472791001972742340671600893 40 27 148 3928319098016626213223126266108909138293 40 27 147 1059731440899197448008447919980441379501 40 27 146 211453127998832226797622238899721354112 39 26 145 8596638131849529112119259481318366958 37 25 144 7127357947893316113116133987497537217 37 25 143 5720903924317060931390607134293090275 37 25 142 27648699559496804140869495599684672 35 24 141 19195442107130706460703170124459191 35 23 140 18372265981602738683720618956227381 35 23 139 16474893155153309090335155139847461 35 23 138 15637564096036245654263069046573651 35 23 137 7987379451262348668432621549737897 34 23 136 6729487375632914884192365737849276 34 23 135 6518224558095760110675908554228156 34 23 134 4618932016420768448670246102398164 34 23 133 1878518083707241221427073808158781 34 23 132 970949920484100222001484029949079 33 23 131 299827328860690707096068823728992 33 22 130 11649798862973099037926889794611 32 21 129 9906904931278180818721394096099 31 21 128 9572173356069427249606533712759 31 21 127 9069068955343348433435598609609 31 21 126 7667147054084671764804507417667 31 21 125 7036943260704741474070623496307 31 21 124 5741151825089698969805281511475 31 21 123 5728587532048900098402357858275 31 21 122 4611350214512508052154120531164 31 21 121 3362492353166948496613532942633 31 21 120 842208027898987789898720802248 30 21 119 82353871105201410250117835328 29 20 118 21236057178117071187175063212 29 19 117 16574056622639593622665047561 29 19 116 10940493925027472052939404901 29 19 115 10292449125322422352194429201 29 19 114 7235556127052662507216555327 28 19 113 6055350633684884863360535506 28 19 112 1748614836827007286384168471 28 19 111 1019311959961221699591139101 28 19 110 969851388806636608883158969 27 19 109 922167654721555127456761229 27 19 108 790099277088767880772990097 27 19 107 763415027039444930720514367 27 19 106 215843270539111935072348512 27 18 105 9249123287115117823219429 25 17 104 7657967335797975337697567 25 17 103 7428429832270722389248247 25 17 102 5896204141868681414026985 25 17 101 5610345593336333955430165 25 17 100 5341702761471741672071435 25 17 99 3816543751182811573456183 25 17 98 2633704311106011134073362 25 17 97 1413439860742470689343141 25 17 96 1092382497262627942832901 25 17 95 14094750446864405749041 23 15 94 11587901815151810978511 23 15 93 7402025863223685202047 22 15 92 5125585490990945855215 22 15 91 4462930249559420392644 22 15 90 939099490555094990939 21 15 89 673587858464858785376 21 14 88 637806211797112608736 21 14 87 251169781828187961152 21 14 86 20360129533592106302 20 13 85 11450847544574805411 20 13 84 9517904104014097159 19 13 83 9459484661664849549 19 13 82 9270992260622990729 19 13 81 8432814151514182348 19 13 80 8092734322234372908 19 13 79 8017702574752077108 19 13 78 7879371694961739787 19 13 77 6852701184811072586 19 13 76 5597872726272787955 19 13 75 4077487289827847704 19 13 74 3467500900090057643 19 13 73 2747530935390357472 19 13 72 1828521298921258281 19 13 71 1227145498945417221 19 13 70 42269242224296224 17 12 69 24191783438719142 17 11 68 23762558085526732 17 11 67 15294534043549251 17 11 66 9917528008257199 16 11 65 8744740440474478 16 11 64 Prime!    961030858030169 15 11 63 831208202802138 15 11 62 673317949713376 15 10 61 635180616081536 15 10 60 616197474791616 15 10 59 19350999905391 14 9 58 18508300380581 14 9 57 Prime!    9115199915119 13 9 56 9028337338209 13 9 55 8760465640678 13 9 54 8605751575068 13 9 53 7707170717077 13 9 52 7511392931157 13 9 51 7225198915227 13 9 50 7138336338317 13 9 49 3406192916043 13 9 48 17039593071 11 7 47 Prime!    11819991811 11 7 46 1551551551 10 7 45 961909169 9 7 44 844252448 9 6 43 65200256 8 6 42 63999936 8 6 41 23900932 8 5 40 13333331 8 5 39 9151519 7 5 38 9030309 7 5 37 Prime!    7696967 7 5 36 7575757 7 5 35 7454547 7 5 34 6383836 7 5 33 6262626 7 5 32 6141416 7 5 31 6020206 7 5 30 4686864 7 5 29 3494943 7 5 28 3373733 7 5 27 Prime!    3252523 7 5 26 3131313 7 5 25 3010103 7 5 24 86368 5 4 23 40704 5 4 22 29792 5 4 21 23832 5 3 20 22622 5 3 19 21412 5 3 18 20202 5 3 17 Prime!    19891 5 3 16 18681 5 3 15 Prime!    17471 5 3 14 7447 4 3 13 1551 4 3 12 22 2 1 11 Prime!    11 2 1 10 9 1 1 9 8 1 1 8 Prime!    7 1 1 7 6 1 1 6 Prime!    5 1 1 5 4 1 1 4 Prime!    3 1 1 3 Prime!    2 1 1 2 1 1 1 1 0 1 1	Index Nr Also palindromic in base 32 A099165 L base 10 L base 32 Next > 10^40 218 8743319468815734039779304375188649133478 40 27 217 7306981228494811137887311184948221896037 40 27 216 1089576879829892386226832989289786759801 40 26 215 1068604321860883896006983880681234068601 40 26 214 731105753210065694020496560012357501137 39 26 213 158030735162336529909925633261537030851 39 26 212 79631741235611395777759311653214713697 38 26 211 39692252688932288211288223988625229693 38 25 210 21378094507492772344327729470549087312 38 25 209 8593354247171895797975981717424533958 37 25 208 8348353494350559277729550534943538438 37 25 207 7912971017863643268623463687101792197 37 25 206 7787269313567421906091247653139627877 37 25 205 6517566220007022823282207000226657156 37 25 204 5196202849020696559556960209482026915 37 25 203 2675004339402320672760232049334005762 37 25 202 1148461198267813405043187628911648411 37 24 201 991831972640326410014623046279138199 36 24 200 903461314006158102201851600413164309 36 24 199 690604338340352571175253043833406096 36 24 198 393695737753417569965714357737596393 36 24 197 289224684977800821128008779486422982 36 24 196 260948833856091393393190658338849062 36 24 195 131674914134385393393583431419476131 36 24 194 37772299864182889098828146899227773 35 23 193 Prime!    16883812041873367076337814021838861 35 23 192 12949187700037911311973000778194921 35 23 191 12373301226111401910411162210337321 35 23 190 12352527252841208880214825272525321 35 23 189 2677959269441261991621449629597762 34 23 188 1424755277771654224561777725574241 34 23 187 1201274898763484774843678984721021 34 22 186 845015864866901323109668468510548 33 22 185 718676657137361383163731756676817 33 22 184 608120745870389767983078547021806 33 22 183 305646939291116494611192939646503 33 22 182 133537361909042545240909163735331 33 22 181 28528630920961911916902903682582 32 21 180 19354629378113022031187392645391 32 21 179 19337115397405666650479351173391 32 21 178 19126195852334455443325859162191 32 21 177 8114119595139939399315959114118 31 21 176 6192071557068116118607551702916 31 21 175 6116015172891715171982715106116 31 21 174 3829258391070970790701938529283 31 21 173 3821656617672933392767166561283 31 21 172 2880317007121244421217007130882 31 21 171 2869992933664589854663392999682 31 21 170 2614637404044687864404047364162 31 21 169 1827120858546155516458580217281 31 21 168 897300387395358853593783003798 30 20 167 893104925898012210898529401398 30 20 166 484776666646053350646666677484 30 20 165 391371651692088880296156173193 30 20 164 391169135792712217297531961193 30 20 163 152526465243081180342564625251 30 20 162 137907458663520025366854709731 30 20 161 75457895768742624786759875457 29 20 160 38749821192037973029112894783 29 19 159 34214632058374547385023641243 29 19 158 19143478453148284135487434191 29 19 157 16630176836909890963867103661 29 19 156 16258064860902920906846085261 29 19 155 506074255457101754552470605 27 18 154 372701203034353430302107273 27 18 153 359099752284777482257990953 27 18 152 52603059691688619695030625 26 18 151 38578568383888838386587583 26 17 150 22579494754900945749497522 26 17 149 13705732732222223723750731 26 17 148 13703835735211253753830731 26 17 147 3650772347537357432770563 25 17 146 2821089475799975749801282 25 17 145 2656455315250525135546562 25 17 144 2654193725506055273914562 25 17 143 1694641834757574381464961 25 17 142 616149465150051564941616 24 16 141 590075625273372526570095 24 16 140 484142293317713392241484 24 16 139 262675914174471419576262 24 16 138 245120134407704431021542 24 16 137 137336214690096412633731 24 16 136 32315008751515780051323 23 15 135 29197716498989461779192 23 15 134 26414001792329710041462 23 15 133 23772269701010796227732 23 15 132 16237179297979297173261 23 15 131 13557154997779945175531 23 15 130 13323559271817295532331 23 15 129 9323872306666032783239 22 15 128 3802421810880181242083 22 15 127 1173275681771865723711 22 14 126 1156524967227694256511 22 14 125 834217851252158712438 21 14 124 720953788010887359027 21 14 123 720704543656345407027 21 14 122 189897262505262798981 21 14 121 118191600999006191811 21 14 120 81298451466415489218 20 14 119 52413912066021931425 20 14 118 50385737133173758305 20 14 117 50193942722724939105 20 14 116 23398054977945089332 20 13 115 5888361733371638885 19 13 114 4650111258521110564 19 13 113 2808927324237298082 19 13 112 2449080129210809442 19 13 111 776016912219610677 18 12 110 571259217712952175 18 12 109 465707571175707564 18 12 108 330774945549477033 18 12 107 112474443344474211 18 12 106 85491930303919458 17 12 105 33303935753930333 17 11 104 27630511811503672 17 11 103 27429643234692472 17 11 102 27402111411120472 17 11 101 Prime!    17624701910742671 17 11 100 17096171817169071 17 11 99 14777935853977741 17 11 98 13177885058877131 17 11 97 Prime!    13150353235305131 17 11 96 Prime!    10894711311749801 17 11 95 10603962026930601 17 11 94 10478015751087401 17 11 93 10263806360836201 17 11 92 3422669229662243 16 11 91 2869960660699682 16 11 90 2297158228517922 16 11 89 1278746666478721 16 11 88 1032078008702301 16 10 87 24916011061942 14 9 86 17438700783471 14 9 85 10641522514601 14 9 84 8867028207688 13 9 83 8842552552488 13 9 82 8825076705288 13 9 81 6886033306886 13 9 80 5842794972485 13 9 79 5806855586085 13 9 78 4462757572644 13 9 77 1462999992641 13 9 76 1232143412321 13 9 75 935448844539 12 8 74 846261162648 12 8 73 691647746196 12 8 72 494889988494 12 8 71 444036630444 12 8 70 421833338124 12 8 69 34318181343 11 7 68 18884748881 11 7 67 14311211341 11 7 66 10269296201 11 7 65 10261916201 11 7 64 8804774088 10 7 63 6806006086 10 7 62 3403003043 10 7 61 2880990882 10 7 60 1219669121 10 7 59 983767389 9 6 58 933909339 9 6 57 388919883 9 6 56 37477473 8 6 55 29800892 8 5 54 25777752 8 5 53 21499412 8 5 52 21033012 8 5 51 18255281 8 5 50 9867689 7 5 49 9802089 7 5 48 9658569 7 5 47 8407048 7 5 46 6882886 7 5 45 6673766 7 5 44 5487845 7 5 43 5422245 7 5 42 4236324 7 5 41 3825283 7 5 40 2639362 7 5 39 1251521 7 5 38 912219 6 4 37 804408 6 4 36 780087 6 4 35 717717 6 4 34 672276 6 4 33 609906 6 4 32 585585 6 4 31 564465 6 4 30 477774 6 4 29 369963 6 4 28 54945 5 4 27 32223 5 3 26 29692 5 3 25 21012 5 3 24 Prime!    19891 5 3 23 15951 5 3 22 9449 4 3 21 6886 4 3 20 5445 4 3 19 2882 4 3 18 1441 4 3 17 858 3 2 16 363 3 2 15 99 2 2 14 66 2 2 13 33 2 2 12 22 2 1 11 Prime!    11 2 1 10 9 1 1 9 8 1 1 8 Prime!    7 1 1 7 6 1 1 6 Prime!    5 1 1 5 4 1 1 4 Prime!    3 1 1 3 Prime!    2 1 1 2 1 1 1 1 0 1 1
Index Nr Also palindromic in base 33 L base 10 L base 33 Next > 10^40 154 2072147262776202148448412026772627412702 40 26 153 232491376439709624212426907934673194232 39 26 152 210400607953046568050865640359706004012 39 26 151 62459728146386871922917868364182795426 38 25 150 32003620247211750311305711274202630023 38 25 149 31158264221111157400475111112246285113 38 25 148 30964017332515968766786951523371046903 38 25 147 8748013840538433587853348350483108478 37 25 146 7377883797695988954598895967973887737 37 25 145 6073056859261310479740131629586503706 37 25 144 5441999065276402054502046725609991445 37 25 143 3256578434394104429244014934348756523 37 25 142 2586354293999272435342729993924536852 37 24 141 72372750800173105850137100805727327 35 23 140 67134797440443783838734404479743176 35 23 139 67100506190242075957024209160500176 35 23 138 59067783999806693139660899938776095 35 23 137 55023363765093996669939056736332055 35 23 136 53971979260513671017631506297917935 35 23 135 48267288995719204140291759988276284 35 23 134 41810938648213955655931284683901814 35 23 133 34581726612175020402057121662718543 35 23 132 28749493814650353535305641839494782 35 23 131 27990243025642504540524652034209972 35 23 130 25300647682272520702527228674600352 35 23 129 24661806747529663736692574760816642 35 23 128 23951530811291123532119211803515932 35 23 127 23854198492059673437695029489145832 35 23 126 18470710851981122022118915801707481 35 23 125 16769572003050167276105030027596761 35 23 124 816005515760541202145067515500618 33 22 123 281367150031321595123130051763182 33 22 122 53521103518012344321081530112535 32 21 121 53220560802805311350820806502235 32 21 120 53194076754646644664645767049135 32 21 119 27376154529998800889992545167372 32 21 118 26627112727688955988672721172662 32 21 117 26383304073715188151737040338362 32 21 116 9567768611721926291271168677659 31 21 115 8395738531048522258401358375938 31 21 114 7542299922265383835622299922457 31 21 113 6930349013536126216353109430396 31 21 112 3382622431648605068461342262833 31 21 111 3218832824094713174904282388123 31 21 110 2522524951595426245951594252252 31 21 109 68850362458650405685426305886 29 19 108 63655097793726562739779055636 29 19 107 62516404736029092063740461526 29 19 106 57958934706134443160743985975 29 19 105 57790700222638083622200709775 29 19 104 56884905933855255833950948865 29 19 103 53958740556464646465504785935 29 19 102 47613479412778887721497431674 29 19 101 46174463182326062328136447164 29 19 100 43707556588109190188565570734 29 19 99 43507554058471317485045570534 29 19 98 43502986589491919498568920534 29 19 97 42797355697916961979655379724 29 19 96 36916657571319291317575661963 29 19 95 32068006497518781579460086023 29 19 94 29043591641718181714619534092 29 19 93 23030636345820702854363603032 29 19 92 19010218333902520933381201091 29 19 91 18312907688858185888670921381 29 19 90 15613176742781018724767131651 29 19 89 12088357860559995506875388021 29 19 88 214072070466555664070270412 27 18 87 45335304109911990140353354 26 17 86 23117687843711734878671132 26 17 85 21799376587900978567399712 26 17 84 4154591633844483361954514 25 17 83 2661423234312134323241662 25 17 82 62149048738283784094126 23 16 81 58138391635053619383185 23 15 80 50466565111711156566405 23 15 79 47395481248684218459374 23 15 78 41355676660206667655314 23 15 77 31131091733433719013113 23 15 76 21171563162426136517112 23 15 75 20401785184048158710402 23 15 74 18951344179897144315981 23 15 73 18765467371517376456781 23 15 72 Prime!    15372082914541928027351 23 15 71 11460655072127055606411 23 15 70 822693624161426396228 21 14 69 668475197020791574866 21 14 68 657092348616843290756 21 14 67 38230911200211903283 20 13 66 37538898355389883573 20 13 65 19409402444420490491 20 13 64 18783954433445938781 20 13 63 9458721256521278549 19 13 62 6602041596951402066 19 13 61 4792519341439152974 19 13 60 3767693732373967673 19 13 59 3419314993994139143 19 13 58 3072610981890162703 19 13 57 49824185758142894 17 11 56 49398817071889394 17 11 55 43902061516020934 17 11 54 39190925052909193 17 11 53 26293112421139262 17 11 52 24361112521116342 17 11 51 22435712721753422 17 11 50 19255758085755291 17 11 49 681321878123186 15 10 48 7087281827807 13 9 47 5239168619325 13 9 46 3298767678923 13 9 45 3125102015213 13 9 44 2957779777592 13 9 43 2908060608092 13 9 42 2736923296372 13 9 41 40909290904 11 7 40 30817071803 11 7 39 28681818682 11 7 38 12483938421 11 7 37 610787016 9 6 36 26811862 8 5 35 26211262 8 5 34 14111141 8 5 33 9012109 7 5 32 7192917 7 5 31 6545456 7 5 30 5153515 7 5 29 4506054 7 5 28 3114113 7 5 27 2369632 7 5 26 Prime!    1820281 7 5 25 1294921 7 5 24 421124 6 4 23 415514 6 4 22 409904 6 4 21 31213 5 3 20 29892 5 3 19 24442 5 3 18 19091 5 3 17 17671 5 3 16 12221 5 3 15 10701 5 3 14 646 3 2 13 272 3 2 12 22 2 1 11 Prime!    11 2 1 10 9 1 1 9 8 1 1 8 Prime!    7 1 1 7 6 1 1 6 Prime!    5 1 1 5 4 1 1 4 Prime!    3 1 1 3 Prime!    2 1 1 2 1 1 1 1 0 1 1	Index Nr Also palindromic in base 34 L base 10 L base 34 Next > 10^20 73 74850890322309805847 20 13 72 49116020022002061194 20 13 71 40329654488445692304 20 13 70 36120528966982502163 20 13 69 13738892611629883731 20 13 68 13464966499466946431 20 13 67 4980354200024530894 19 13 66 3068265789875628603 19 13 65 66618580008581666 17 11 64 66387132523178366 17 11 63 63344575857544336 17 11 62 62703992029930726 17 11 61 57360531413506375 17 11 60 51914591419541915 17 11 59 46571130803117564 17 11 58 42805321512350824 17 11 57 41596743034769514 17 11 56 29974237873247992 17 11 55 26712276167221762 17 11 54 11727327672372711 17 11 53 Prime!    11376545454567311 17 11 52 7894167667614987 16 11 51 6173061111603716 16 11 50 3630457117540363 16 11 49 3033080770803303 16 11 48 43649088094634 14 9 47 9950190910599 13 9 46 9326196916239 13 9 45 5641401041465 13 9 44 4048267628404 13 9 43 43590509534 11 7 42 35793239753 11 7 41 30632523603 11 7 40 30268686203 11 7 39 28185658182 11 7 38 22835253822 11 7 37 18319091381 11 7 36 6447777446 10 7 35 5086996805 10 7 34 4601881064 10 7 33 525868525 9 6 32 31500513 8 5 31 29622692 8 5 30 8632368 7 5 29 8066608 7 5 28 7446447 7 5 27 5020205 7 5 26 2967692 7 5 25 38283 5 3 24 32123 5 3 23 31613 5 3 22 28482 5 3 21 27972 5 3 20 21812 5 3 19 Prime!    16061 5 3 18 Prime!    15551 5 3 17 9119 4 3 16 2552 4 3 15 595 3 2 14 525 3 2 13 33 2 1 12 22 2 1 11 Prime!    11 2 1 10 9 1 1 9 8 1 1 8 Prime!    7 1 1 7 6 1 1 6 Prime!    5 1 1 5 4 1 1 4 Prime!    3 1 1 3 Prime!    2 1 1 2 1 1 1 1 0 1 1
Index Nr Also palindromic in base 35 L base 10 L base 35 Next > 10^20 86 80804050955905040808 20 13 85 76992678711787629967 20 13 84 76505756233265750567 20 13 83 48005895800859850084 20 13 82 26359176200267195362 20 13 81 7794403740473044977 19 13 80 7775913126213195777 19 13 79 7736456939396546377 19 13 78 7675459513159545767 19 13 77 7458819033309188547 19 13 76 7377239767679327737 19 13 75 7360219995999120637 19 13 74 7062044826284402607 19 13 73 6386383582853836836 19 13 72 6187432844482347816 19 13 71 2192548599958452912 19 12 70 840796119911697048 18 12 69 801949761167949108 18 12 68 94935358285353949 17 11 67 94912815351821949 17 11 66 94506362726360549 17 11 65 94154052825045149 17 11 64 Prime!    75930888788803957 17 11 63 75138056765083157 17 11 62 75113827972831157 17 11 61 56584814841848565 17 11 60 56528122722182565 17 11 59 56120175257102165 17 11 58 40916991319961904 17 11 57 40543993339934504 17 11 56 Prime!    37964160106146973 17 11 55 Prime!    37589506860598573 17 11 54 21548685358684512 17 11 53 21175687378657112 17 11 52 18571625352617581 17 11 51 17731713731713771 17 11 50 17302023632020371 17 11 49 232131696131232 15 10 48 217030505030712 15 10 47 30869533596803 14 9 46 28165944956182 14 9 45 Prime!    9710780870179 13 9 44 9638309038369 13 9 43 8703990993078 13 9 42 2121358531212 13 8 41 2102654562012 13 8 40 69497279496 11 8 39 56028182065 11 7 38 55972827955 11 7 37 55964546955 11 7 36 34145054143 11 7 35 Prime!    33842924833 11 7 34 33834643833 11 7 33 23780308732 11 7 32 23772027732 11 7 31 12599199521 11 7 30 9166226619 10 7 29 26922962 8 5 28 Prime!    1881881 7 5 27 65556 5 4 26 63036 5 4 25 42524 5 3 24 34643 5 3 23 27672 5 3 22 21612 5 3 21 19791 5 3 20 14641 5 3 19 13731 5 3 18 3993 4 3 17 2662 4 3 16 1331 4 3 15 828 3 2 14 252 3 2 13 33 2 1 12 22 2 1 11 Prime!    11 2 1 10 9 1 1 9 8 1 1 8 Prime!    7 1 1 7 6 1 1 6 Prime!    5 1 1 5 4 1 1 4 Prime!    3 1 1 3 Prime!    2 1 1 2 1 1 1 1 0 1 1	Index Nr Also palindromic in base 36 A250412 L base 10 L base 36 Next > 10^20 98 89811756188165711898 20 13 97 89128718100181782198 20 13 96 68332722733722723386 20 13 95 40685060744706058604 20 13 94 21783718822881738712 20 13 93 5056422359532246505 19 13 92 2476507590957056742 19 12 91 854404185581404458 18 12 90 839256186681652938 18 12 89 116979806608979611 18 11 88 77305171417150377 17 11 87 70701803330810707 17 11 86 70649867676894607 17 11 85 70546180208164507 17 11 84 66934618481643966 17 11 83 57673510101537675 17 11 82 50813624942631805 17 11 81 46524937473942564 17 11 80 46421250005212464 17 11 79 13906815051860931 17 11 78 5804986116894085 16 11 77 389004000400983 15 10 76 361400848004163 15 10 75 343201454102343 15 10 74 85582866828558 14 9 73 67743488434776 14 9 72 32866755766823 14 9 71 28420977902482 14 9 70 25120399302152 14 9 69 3955010105593 13 9 68 2402398932042 13 8 67 1679755579761 13 8 66 73533033537 11 7 65 71904040917 11 7 64 66516061566 11 7 63 66394149366 11 7 62 61664946616 11 7 61 59552225595 11 7 60 56276967265 11 7 59 56102620165 11 7 58 54647974645 11 7 57 49931613994 11 7 56 44596069544 11 7 55 37579097573 11 7 54 37280408273 11 7 53 27958485972 11 7 52 22446164422 11 7 51 952343259 9 6 50 48655684 8 5 49 10066001 8 5 48 9488849 7 5 47 9242429 7 5 46 6950596 7 5 45 6918196 7 5 44 5927295 7 5 43 5182815 7 5 42 4306034 7 5 41 Prime!    3315133 7 5 40 1867681 7 5 39 1301031 7 4 38 987789 6 4 37 741147 6 4 36 159951 6 4 35 42224 5 3 34 37973 5 3 33 36063 5 3 32 33433 5 3 31 Prime!    30803 5 3 30 21112 5 3 29 19491 5 3 28 16861 5 3 27 12321 5 3 26 5115 4 3 25 2882 4 3 24 1441 4 3 23 1221 4 2 22 999 3 2 21 888 3 2 20 777 3 2 19 666 3 2 18 555 3 2 17 444 3 2 16 333 3 2 15 222 3 2 14 111 3 2 13 33 2 1 12 22 2 1 11 Prime!    11 2 1 10 9 1 1 9 8 1 1 8 Prime!    7 1 1 7 6 1 1 6 Prime!    5 1 1 5 4 1 1 4 Prime!    3 1 1 3 Prime!    2 1 1 2 1 1 1 1 0 1 1
Index Nr Also palindromic in base 37 L base 10 L base 37 Next > 10^40	Index Nr Also palindromic in base 38 L base 10 L base 38 Next > 10^40
Index Nr Also palindromic in base 39 L base 10 L base 39 Next > 10^40	Index Nr Also palindromic in base 40 L base 10 L base 40 Next > 10^40
Index Nr Also palindromic in base 41 L base 10 L base 41 Next > 10^40	Index Nr Also palindromic in base 42 L base 10 L base 42 Next > 10^40
Index Nr Also palindromic in base 43 L base 10 L base 43 Next > 10^40	Index Nr Also palindromic in base 44 L base 10 L base 44 Next > 10^40
Index Nr Also palindromic in base 45 L base 10 L base 45 Next > 10^40	Index Nr Also palindromic in base 46 L base 10 L base 46 Next > 10^40
Index Nr Also palindromic in base 47 L base 10 L base 47 Next > 10^40	Index Nr Also palindromic in base 48 L base 10 L base 48 Next > 10^40
Index Nr Also palindromic in base 49 L base 10 L base 49 Next > 10^40	Index Nr Also palindromic in base 50 L base 10 L base 50 Next > 10^40
Index Nr Also palindromic in base 51 L base 10 L base 51 Next > 10^40	Index Nr Also palindromic in base 52 L base 10 L base 52 Next > 10^40
Index Nr Also palindromic in base 53 L base 10 L base 53 Next > 10^40	Index Nr Also palindromic in base 54 L base 10 L base 54 Next > 10^40
Index Nr Also palindromic in base 55 L base 10 L base 55 Next > 10^40	Index Nr Also palindromic in base 56 L base 10 L base 56 Next > 10^40
Index Nr Also palindromic in base 57 L base 10 L base 57 Next > 10^40	Index Nr Also palindromic in base 58 L base 10 L base 58 Next > 10^40
Index Nr Also palindromic in base 59 L base 10 L base 59 Next > 10^40	Index Nr Also palindromic in base 60 A262069 L base 10 L base 60 Next >10^20 88 19260605633650606291 20 11 87 19109139233293190191 20 11 86 19108306011060380191 20 11 85 12953949300394935921 20 11 84 1059511493941159501 19 11 83 1008860210120688001 19 11 82 111705028820507111 18 10 81 96791647174619769 17 10 80 94855661216655849 17 10 79 94812756665721849 17 10 78 90820011311002809 17 10 77 86756027772065768 17 10 76 84686895859868648 17 10 75 78698827572889687 17 10 74 70632865556823607 17 10 73 62576136663167526 17 10 72 44454350005345444 17 10 71 40448567076584404 17 10 70 26334850305843362 17 10 69 18278121412187281 17 10 68 18235216861253281 17 10 67 6140607337060416 16 9 66 5979490660949795 16 9 65 4056041771406504 16 9 64 4041670880761404 16 9 63 2114962552694112 16 9 62 2114927447294112 16 9 61 1997507557057991 16 9 60 1982186226812891 16 9 59 1927217227127291 16 9 58 1912846336482191 16 9 57 1021449441201 13 7 56 872376673278 12 7 55 872322223278 12 7 54 2230660322 10 6 53 1486446841 10 6 52 608363806 9 5 51 607272706 9 5 50 606181606 9 5 49 605090506 9 5 48 603070306 9 5 47 589616985 9 5 46 588525885 9 5 45 587434785 9 5 44 586343685 9 5 43 585252585 9 5 42 584161485 9 5 41 451929154 9 5 40 450838054 9 5 39 Prime!    301969103 9 5 38 155505551 9 5 37 155343551 9 5 36 154414451 9 5 35 Prime!    154252451 9 5 34 Prime!    153323351 9 5 33 153161351 9 5 32 152232251 9 5 31 152070251 9 5 30 151141151 9 5 29 150050051 9 5 28 28933982 8 5 27 26233262 8 5 26 14033041 8 5 25 11166111 8 4 24 8372738 7 4 23 2796972 7 4 22 148841 6 3 21 113311 6 3 20 57375 5 3 19 57075 5 3 18 55755 5 3 17 55455 5 3 16 55155 5 3 15 55 2 1 14 44 2 1 13 33 2 1 12 22 2 1 11 Prime!    11 2 1 10 9 1 1 9 8 1 1 8 Prime!    7 1 1 7 6 1 1 6 Prime!    5 1 1 5 4 1 1 4 Prime!    3 1 1 3 Prime!    2 1 1 2 1 1 1 1 0 1 1

Palindromes in bases 2 and 10.
The main source for this table comes from the following weblink.
Binary/Decimal Palindromes by Charlton Harrison (email) from Austin, Texas.
See also Sloane's sequences A007632 and A046472.

" I just finished writing a distributed client/server program for finding these numbers, and I currently
have it running on 4 different machines at the same time and I'm finding them A LOT faster. That's how
I was able to come up with those new ones. I'd say there are more to come in the near future, too."

[ December 1, 2001 ] Charlton Harrison once found this record binarydecimal palindrome 110 0010111100 0010101010 1101000011 1010000010 0000101110 0001011010 1010100001 1110100011 7475703079870789703075747 The binary string contains 83 digits !

---

[ April 11, 2003 ]
Dw (email) wrote me the following :

"Using a backtracking solver, I have found larger numbers.
The first of these, which is the next after the one mentioned above, is
50824513851188115831542805 (86 bit, 3*5*11*11*17*17*83*11974799*97488286319).
There are no other 86 bit double palindromes.

I also have found two 89 bit double palindromes, but I am not sure if they
are the next ones. There may be some lower ones in 89 bit (haven't searched
that space completely yet) or in 87 bit that I haven't found.

These numbers are
532079161251434152161970235 (5*29*85839676103*42748430836381)
and
552963956270141072659369255 (5*7*7*71*441607*71984077228507867)
As can be seen by their factor representation, they are all composite."

---

---

[ April 13, 2003 ] Dw once found this record binarydecimal palindrome 1010010001 1101011100 1110010101 0010100001 0100000010 1000010100 1010100111 0011101011 1000100101 795280629691202196926082597 The binary string contains 90 digits ! The decimal string contains 27 digits !

---

---

[ May 21, 2003 ] Dw once found this record binarydecimal palindrome 1 0100110010 1111101111 1100001110 1100100000 0010001000 0000100110 1110000111 1110111110 1001100101 1609061098335005338901609061 The binary palindrome contains 91 digits ! The decimal string contains 28 digits !

---

---

[ June 12, 2003 ]
Dw (email) found new Binary/Decimal Palindromes :

"I rewrote my program to use another strategy at finding the numbers, and this
let me search somewhat faster. As a result, I have found binary/decimal
palindromes up to 102 bits -- broke the 100 bit barrier so to speak.

These are:

None at 92 or 93 bits.
17869806142184248124160896871 (94 bits)
19756291244127372144219265791 (94 bits)
30000258151173237115185200003 (95 bits)
30658464822225352222846485603 (95 bits)
56532345659072227095654323565 (96 bits)
None at 97 or 98 bits.
378059787464677776464787950873 (99 bits)
1115792035060833380605302975111 (100 bits)
None at 101 bits.
3390741646331381831336461470933 (102 bits)

There may be higher ones at 102 bits; I haven't completed the search there."

---

---

[ June 17, 2003 ]
Dw (email) adds :

" There are no numbers for 103 bits."

[ Note : In fact there is one! See index number 97. PDG ]

[ June 17, 2003 ] Dw once found this record binarydecimal palindrome 10 1010110011 0000010011 1100000010 0001000111 1010010111 1010010111 1000100001 0000001111 0010000011 0011010101 3390741646331381831336461470933 The binary palindrome contains 102 digits ! The decimal string contains 31 digits !

---

Binary/Decimal Palindromes by Charlton Harrison (email) : the longest list in existence ?

---

[ September 30, 2015 ]
Three more stunning numbers could be retrieved from Sloane's OEIS database.
See index numbers 124, 125 & 126.

[ September 30, 2015 ] A former record binarydecimal palindrome 100110011011011101000001000010000011000111001011100111100011101000 00101110001111001110100111000110000010000100000101110110110011001 1634587141488515712882175158841417854361 The binary palindrome contains 131 digits ! The decimal string contains 40 digits !

---

[ March 8, 2020 ]
Many more numbers could be retrieved from Sloane's OEIS database.
See index numbers up to 147. The record dates from the end of 2015.

[ December 30, 2015 ] The current record binarydecimal palindrome Search team : Robert G. Wilson v, Charlton Harrison, Ilya Nikulshin & Andrey Astrelin 11010001010011101000000001001100010000000010110001011110100100101011100110101 0101100111010100100101111010001101000000001000110010000000010111001010001011 9335388324586156026843333486206516854238835339 The binary palindrome contains 153 digits ! The decimal string contains 46 digits !

---

Richard Jones
Dual-base Palindromes (decimal & binary)
[ zo 21/06/2026, 3:13 ]

---

Submitted entries [184] up to [187] for the base 2 (binary) case.

I haven't looked at this problem for a long while -- the current record in your list are the 7 palindromes at D=55.
I can confirm that D=56 is empty of palindromes but D=57 has the following numbers:

171265652192757695823295496474694592328596757291256562171,
172998361891299508580833631575136338085805992198163899271,
502340045424300390133813486575684318331093003424540043205,
565566103094990344765405851070158504567443099490301665565

That list is exhaustive at D=57.

I'll probably get round to running D=58, 59 and 60 at some stage. Though that is the limit of tractability
short of some number theoretic breakthrough. I believe Eshed's code will do D=55 in about 3 days or so --- I have
got that down to about 10 hours. D=57 took over 40 hours -- D=58 will be similar --- D=59 and 60 will take about
8 days each --- I may or may not bother LOL - I do have a life outside of this stuff that needs my computer time.

Regards,

Richard

---

Richard Jones
Dual-base Palindromes (decimal & binary)
[ do 2/07/2026, 20:48 ]

---

Submitted entry [188] for the base 2 (binary) case.

Hi Patrick,

Here is a new monster -- a decimal binary palindrome of 58 digits
1319486966107346543235142590660952415323456437016696849131
verified dual decimal/binary palindrome.

D=58 run not finished but it is quite a ways through and so this is likely the only solution.

Regards,

Richard

---

Richard Jones
Dual-base Palindromes (decimal & binary)
[ do 6/07/2026, 20:48 ]

---

Submitted entry [189] for the base 2 (binary) case.

---

Richard Jones
Complete exhaustive scan of D=58 for decimal/binary palindromes
[ di 7/07/2026, 8:49 ]

---

Hi Patrick,

I gave you two earlier but it found another right near the end of the search.

The complete list of D=58 dual palindromes is [188][189][190]:

{1319486966107346543235142590660952415323456437016696849131, \
1698561202464250881399736183223816379931880524642021658961, \
9526542992481751283981451209119021541893821571842992456259}

Regards,

Richard

---

Richard Jones
More dual palindromes
[ ma 20/07/2026, 10:00 ]

---

Submitted entries [191] up to [196] for the base 2 (binary) case.

Hi Patrick,

I am currently running D=60 for decimal/binary -- that will be it for me on that front.

Regards,

Richard

---

Richard Jones
More dual palindromes
[ ma 23/07/2026, 7:42 ]

---

Submitted entry [197] for the base 2 (binary) case.

Hi Patrick,

D=60 had one decimal/binary palindrome.

306758574604027401406795081119911180597604104720406475857603

Regards,

Richard

---

Eshed Schacham
Binary-decimal palindromes
[ wo 29/07/2026, 17:24 ]

---

Submitted entries [198] up to [201] for the base 2 (binary) case.

Hi Patrick,

Richard's latest achievements inspired me to improve my algorithm a bit, particularly its memory consumption.
So here are the binary-decimal palindromes of decimal length 61.

Cheers,
Eshed

---

Richard Jones
More numbers:
[ vr 14/08/2026, 14:03 ]

---

Submitted entries [202] up to [204] for the base 3 case (decimal/binary).

Hi Patrick,

Eshed is on vacation and it takes him 8.5 days to do D=61/62 for decimal/binary.
And he only did D=61 and not D=62

Anyway I got it D=62 to run in 25 hours -- so here are the three palindromes for D=62:
…
…
So we have completed dec/bin to D=62

Regards,

Richard

---

Richard Jones
decimal/binary D=63
[ wo 19/08/2026, 18:52 ]

---

Submitted entries [205] up to [212] for the case decimal/binary.

Hi Patrick,

Here are the solutions for D=63 of decimal/binary palindromes.
…
…
I got it down to 55 hours. I am running D=64 at the moment.

I can do D=65 and D=66 theoretically but they will take 7 days each.

Regards,

Richard

---

Richard Jones
decimal/binary D=64
[ wo 19/08/2026, 23:11 ]

---

Hi Patrick,

D=64 is 3.5 hours into running as I type this. I'm just running into the fundamental limitations of my computer now.
D=65/66 would be 7 days each -- and I have tried every clever trick I can think of -- I have said that before and improved
things but I feel there is only so much you can do with 32 GPU cores and 64GB of RAM.

I still have T=117 and T=119 to do on ternary/binary -- anything beyond that is unlikely. I stopped decimal/ternary at
D=50 --- that is a hard case to push further as well.

As I come to the end of these palindrome searches I hope I have been of some help -- it's fun trying to push a laptop
as far as I think is possible on brute force number crunching.

Regards,

Richard

---

Richard Jones
decimal/ternary at D=64
[ za 22/08/2026, 7:49 ]

---

Submitted entry [213] for the decimal/binary case.

Hi Patrick,

D=64 had one solution:

9225661674600671492119413057030110307503149112941760064761665229

Regards,

Richard

---

Binary/Decimal Palindromes by Charlton Harrison (email) : the longest list in existence ?

Neil Sloane's "Integer Sequences" Encyclopedia can be consulted online : Neil Sloane's Integer Sequences I sampled the following base X palindromic numbers sequences from the table : %N Binary expansion is palindromic. under A006995 -- Sum of digits A043261 %N Palindromes in base 3 (written in base 10). under A014190 -- Sum of digits A043262 %N Palindromes in base 4 (written in base 10). under A014192 -- Sum of digits A043263 %N Palindromic in base 5. under A029952 -- Sum of digits A043264 %N Palindromic in base 6. under A029953 -- Sum of digits A043265 %N Palindromic in base 7. under A029954 -- Sum of digits A043266 %N Palindromic in base 8. under A029803 -- Sum of digits A043267 %N Palindromic in base 9. under A029955 -- Sum of digits A043268 %N Palindromes. under A002113 -- Sum of digits A043269 %N Palindromic in base 11. under A029956 -- Sum of digits A043270 %N Palindromic in base 12. under A029957 -- Sum of digits A043271 %N Palindromic in base 13. under A029958 -- Sum of digits A043272 %N Palindromic in base 14. under A029959 -- Sum of digits A043273 %N Palindromic in base 15. under A029960 -- Sum of digits A043274 %N Palindromic in base 16. under A029730 -- Sum of digits A043275 %N Palindromic in bases 2 and 3. under A060792. %N Palindromic in bases 2 and 10. under A007632. %N Palindromic in bases 3 and 10. under A007633. %N Palindromic in bases 4 and 10. under A029961. %N Palindromic in bases 5 and 10. under A029962. %N Palindromic in bases 6 and 10. under A029963. %N Palindromic in bases 7 and 10. under A029964. %N Palindromic in base 8 and base 10. under A029804. %N Palindromic in bases 9 and 10. under A029965. %N Palindromic in bases 11 and 10. under A029966. %N Palindromic in bases 12 and 10. under A029967. %N Palindromic in bases 13 and 10. under A029968. %N Palindromic in bases 14 and 10. under A029969. %N Palindromic in bases 15 and 10. under A029970. %N Square in base 2 is a palindrome. under A003166. %N Squares which are palindromes in base 2. under A029983. %N n^2 is palindromic in base 3. under A029984. %N Squares which are palindromic in base 3. under A029985. %N n^2 is palindromic in base 4. under A029986. %N Squares which are palindromic in base 4. under A029987. %N n^2 is palindromic in base 5. under A029988. %N Squares which are palindromic in base 5. under A029989. %N n^2 is palindromic in base 6. under A029990. %N Squares which are palindromic in base 6. under A029991. %N n^2 is palindromic in base 7. under A029992. %N Squares which are palindromic in base 7. under A029993. %N n^2 is palindromic in base 8. under A029805. %N n in base 8 is a palindromic square. under A029806. %N n^2 is palindromic in base 9. under A029994. %N Squares which are palindromic in base 9. under A029995. %N Square is a palindrome. under A002778. %N Palindromic Squares. under A002779. %N n^2 is palindromic in base 11. under A029996. %N Squares which are palindromic in base 11. under A029997. %N n^2 is palindromic in base 12. under A029737. %N Squares which are palindromic in base 12. under A029738. %N n^2 is palindromic in base 13. under A029998. %N Squares which are palindromic in base 13. under A029999. %N n^2 is palindromic in base 14. under A030072. %N Squares which are palindromes in base 14. under A030074. %N n^2 is palindromic in base 15. under A030073. %N Squares which are palindromes in base 15. under A030075. %N n^2 is palindromic in base 16. under A029733. %N Palindromic squares in base 16. under A029734. %N n^3 is palindromic in base 4. under A046231. %N Cubes which are palindromes in base 4. under A046232. %N n^3 is palindromic in base 5. under A046233. %N Cubes which are palindromes in base 5. under A046234. %N n^3 is palindromic in base 6. under A046235. %N Cubes which are palindromes in base 6. under A046236. %N n^3 is palindromic in base 7. under A046237. %N Cubes which are palindromes in base 7. under A046238. %N n^3 is palindromic in base 8. under A046239. %N Cubes which are palindromes in base 8. under A046240. %N n^3 is palindromic in base 9. under A046241. %N Cubes which are palindromes in base 9. under A046242. %N Cube is a palindrome. under A002780. %N Palindromic cubes. under A002781. %N n^3 is palindromic in base 11. under A046243. %N Cubes which are palindromes in base 11. under A046244. %N n^3 is palindromic in base 12. under A046245. %N Cubes which are palindromes in base 12. under A046246. %N n^3 is palindromic in base 13. under A046247. %N Cubes which are palindromes in base 13. under A046248. %N n^3 is palindromic in base 14. under A046249. %N Cubes which are palindromes in base 14. under A046250. %N n^3 is palindromic in base 15. under A046251. %N Cubes which are palindromes in base 15. under A046252. %N n^3 is palindromic in base 16. under A029735. %N Cubes which are palindromes in base 16. under A029736. %N Palindromic primes in base 2. under A016041. %N Palindromic primes in base 3. under A029971. %N Palindromic primes in base 4. under A029972. %N Palindromic primes in base 5. under A029973. %N Palindromic primes in base 6. under A029974. %N Palindromic primes in base 7. under A029975. %N Palindromic primes in base 8. under A029976. %N Octal palindromes which are also primes. under A006341. %N Palindromic primes in base 9. under A029977. %N Palindromic primes. under A002385. %N Palindromic primes in base 11. under A029978. %N Palindromic primes in base 12. under A029979. %N Palindromic primes in base 13. under A029980. %N Palindromic primes in base 14. under A029981. %N Palindromic primes in base 15. under A029982. %N Palindromic primes in base 16. under A029732. %N Palindromic primes in base 10 and base 2. under A046472. %N Palindromic primes in base 10 and base 3. under A046473. %N Palindromic primes in base 10 and base 4. under A046474. %N Palindromic primes in base 10 and base 6. under A046475. %N Palindromic primes in base 10 and base 7. under A046476. %N Palindromic primes in base 10 and base 8. under A046477. %N Palindromic primes in base 10 and base 9. under A046478. %N Palindromic primes. under A002385. %N Palindromic primes in base 10 and base 11. under A046479. %N Palindromic primes in base 10 and base 12. under A046480. %N Palindromic primes in base 10 and base 13. under A046481. %N Palindromic primes in base 10 and base 14. under A046482. %N Palindromic primes in base 10 and base 15. under A046483. %N Palindromic primes in base 10 and base 16. under A046484. %N Palindromic primes in bases 2 and 4. under A056130. %N Palindromic primes in bases 2 and 8. under A056145. %N Palindromic primes in bases 4 and 8. under A056146. %N Not palindromic in any base from 2 to n-2. under A016038. %N Smallest palindrome greater than n in bases n and n+1. under A048268. %N First palindrome greater than n+2 in bases n+2 and n. under A048269. %N The first non-trivial (k>n+2) palindromic prime in both bases n and n+2. under A057199. %N Symmetric bit strings (bit-reverse palindromes), including as many leading as trailing zeros. under A057890. Click here to view some of the author's [P. De Geest] entries to the table. Click here to view some entries to the table about palindromes.

A043001 n-th base 3 palindrome that starts with 1. - Clark Kimberling A043002 n-th base 3 palindrome that starts with 2. - Clark Kimberling A043003 n-th base 4 palindrome that starts with 1. - Clark Kimberling A043004 n-th base 4 palindrome that starts with 2. - Clark Kimberling A043005 n-th base 4 palindrome that starts with 3. - Clark Kimberling A043006 n-th base 5 palindrome that starts with 1. - Clark Kimberling A043007 n-th base 5 palindrome that starts with 2. - Clark Kimberling A043008 n-th base 5 palindrome that starts with 3. - Clark Kimberling A043009 n-th base 5 palindrome that starts with 4. - Clark Kimberling A043010 n-th base 6 palindrome that starts with 1. - Clark Kimberling A043011 n-th base 6 palindrome that starts with 2. - Clark Kimberling A043012 n-th base 6 palindrome that starts with 3. - Clark Kimberling A043013 n-th base 6 palindrome that starts with 4. - Clark Kimberling A043014 n-th base 6 palindrome that starts with 5. - Clark Kimberling A043015 n-th base 7 palindrome that starts with 1. - Clark Kimberling A043016 n-th base 7 palindrome that starts with 2. - Clark Kimberling A043017 n-th base 7 palindrome that starts with 3. - Clark Kimberling A043018 n-th base 7 palindrome that starts with 4. - Clark Kimberling A043019 n-th base 7 palindrome that starts with 5. - Clark Kimberling A043020 n-th base 7 palindrome that starts with 6. - Clark Kimberling A043021 n-th base 8 palindrome that starts with 1. - Clark Kimberling A043022 n-th base 8 palindrome that starts with 2. - Clark Kimberling A043023 n-th base 8 palindrome that starts with 3. - Clark Kimberling A043024 n-th base 8 palindrome that starts with 4. - Clark Kimberling A043025 n-th base 8 palindrome that starts with 5. - Clark Kimberling A043026 n-th base 8 palindrome that starts with 6. - Clark Kimberling A043027 n-th base 8 palindrome that starts with 7. - Clark Kimberling A043028 n-th base 9 palindrome that starts with 1. - Clark Kimberling A043029 n-th base 9 palindrome that starts with 2. - Clark Kimberling A043030 n-th base 9 palindrome that starts with 3. - Clark Kimberling A043031 n-th base 9 palindrome that starts with 4. - Clark Kimberling A043032 n-th base 9 palindrome that starts with 5. - Clark Kimberling A043033 n-th base 9 palindrome that starts with 6. - Clark Kimberling A043034 n-th base 9 palindrome that starts with 7. - Clark Kimberling A043035 n-th base 9 palindrome that starts with 8. - Clark Kimberling A043036 n-th base 10 palindrome that starts with 1. - Clark Kimberling A043037 n-th base 10 palindrome that starts with 2. - Clark Kimberling A043038 n-th base 10 palindrome that starts with 3. - Clark Kimberling A043039 n-th base 10 palindrome that starts with 4. - Clark Kimberling A043040 n-th base 10 palindrome that starts with 5. - Clark Kimberling A043041 n-th base 10 palindrome that starts with 6. - Clark Kimberling A043042 n-th base 10 palindrome that starts with 7. - Clark Kimberling A043043 n-th base 10 palindrome that starts with 8. - Clark Kimberling A043044 n-th base 10 palindrome that starts with 9. - Clark Kimberling

A043045 a(n)=(s(n)+2)/3, where s(n)=n-th base 3 palindrome that starts with 1. - Clark Kimberling A043046 a(n)=(s(n)+1)/3, where s(n)=n-th base 3 palindrome that starts with 2. - Clark Kimberling A043047 a(n)=(s(n)+3)/4, where s(n)=n-th base 4 palindrome that starts with 1. - Clark Kimberling A043048 a(n)=(s(n)+2)/4, where s(n)=n-th base 4 palindrome that starts with 2. - Clark Kimberling A043049 a(n)=(s(n)+1)/4, where s(n)=n-th base 4 palindrome that starts with 3. - Clark Kimberling A043050 a(n)=(s(n)+4)/5, where s(n)=n-th base 5 palindrome that starts with 1. - Clark Kimberling A043051 a(n)=(s(n)+3)/5, where s(n)=n-th base 5 palindrome that starts with 2. - Clark Kimberling A043052 a(n)=(s(n)+2)/5, where s(n)=n-th base 5 palindrome that starts with 3. - Clark Kimberling A043053 a(n)=(s(n)+1)/5, where s(n)=n-th base 5 palindrome that starts with 4. - Clark Kimberling A043054 a(n)=(s(n)+5)/6, where s(n)=n-th base 6 palindrome that starts with 1. - Clark Kimberling A043055 a(n)=(s(n)+4)/6, where s(n)=n-th base 6 palindrome that starts with 2. - Clark Kimberling A043056 a(n)=(s(n)+3)/6, where s(n)=n-th base 6 palindrome that starts with 3. - Clark Kimberling A043057 a(n)=(s(n)+2)/6, where s(n)=n-th base 6 palindrome that starts with 4. - Clark Kimberling A043058 a(n)=(s(n)+1)/6, where s(n)=n-th base 6 palindrome that starts with 5. - Clark Kimberling A043059 a(n)=(s(n)+6)/7, where s(n)=n-th base 7 palindrome that starts with 1. - Clark Kimberling A043060 a(n)=(s(n)+5)/7, where s(n)=n-th base 7 palindrome that starts with 2. - Clark Kimberling A043061 a(n)=(s(n)+4)/7, where s(n)=n-th base 7 palindrome that starts with 3. - Clark Kimberling A043062 a(n)=(s(n)+3)/7, where s(n)=n-th base 7 palindrome that starts with 4. - Clark Kimberling A043063 a(n)=(s(n)+2)/7, where s(n)=n-th base 7 palindrome that starts with 5. - Clark Kimberling A043064 a(n)=(s(n)+1)/7, where s(n)=n-th base 7 palindrome that starts with 6. - Clark Kimberling A043065 a(n)=(s(n)+7)/8, where s(n)=n-th base 8 palindrome that starts with 1. - Clark Kimberling A043066 a(n)=(s(n)+6)/8, where s(n)=n-th base 8 palindrome that starts with 2. - Clark Kimberling A043067 a(n)=(s(n)+5)/8, where s(n)=n-th base 8 palindrome that starts with 3. - Clark Kimberling A043068 a(n)=(s(n)+4)/8, where s(n)=n-th base 8 palindrome that starts with 4. - Clark Kimberling A043069 a(n)=(s(n)+3)/8, where s(n)=n-th base 8 palindrome that starts with 5. - Clark Kimberling A043070 a(n)=(s(n)+2)/8, where s(n)=n-th base 8 palindrome that starts with 6. - Clark Kimberling A043071 a(n)=(s(n)+1)/8, where s(n)=n-th base 8 palindrome that starts with 7. - Clark Kimberling A043072 a(n)=(s(n)+8)/9, where s(n)=n-th base 9 palindrome that starts with 1. - Clark Kimberling A043073 a(n)=(s(n)+7)/9, where s(n)=n-th base 9 palindrome that starts with 2. - Clark Kimberling A043074 a(n)=(s(n)+6)/9, where s(n)=n-th base 9 palindrome that starts with 3. - Clark Kimberling A043075 a(n)=(s(n)+5)/9, where s(n)=n-th base 9 palindrome that starts with 4. - Clark Kimberling A043076 a(n)=(s(n)+4)/9, where s(n)=n-th base 9 palindrome that starts with 5. - Clark Kimberling A043077 a(n)=(s(n)+3)/9, where s(n)=n-th base 9 palindrome that starts with 6. - Clark Kimberling A043078 a(n)=(s(n)+2)/9, where s(n)=n-th base 9 palindrome that starts with 7. - Clark Kimberling A043079 a(n)=(s(n)+1)/9, where s(n)=n-th base 9 palindrome that starts with 8. - Clark Kimberling A043080 a(n)=(s(n)+9)/10, where s(n)=n-th base 10 palindrome that starts with 1. - Clark Kimberling A043081 a(n)=(s(n)+8)/10, where s(n)=n-th base 10 palindrome that starts with 2. - Clark Kimberling A043082 a(n)=(s(n)+7)/10, where s(n)=n-th base 10 palindrome that starts with 3. - Clark Kimberling A043083 a(n)=(s(n)+6)/10, where s(n)=n-th base 10 palindrome that starts with 4. - Clark Kimberling A043084 a(n)=(s(n)+5)/10, where s(n)=n-th base 10 palindrome that starts with 5. - Clark Kimberling A043085 a(n)=(s(n)+4)/10, where s(n)=n-th base 10 palindrome that starts with 6. - Clark Kimberling A043086 a(n)=(s(n)+3)/10, where s(n)=n-th base 10 palindrome that starts with 7. - Clark Kimberling A043087 a(n)=(s(n)+2)/10, where s(n)=n-th base 10 palindrome that starts with 8. - Clark Kimberling A043088 a(n)=(s(n)+1)/10, where s(n)=n-th base 10 palindrome that starts with 9. - Clark Kimberling A016038 Strictly non-palindromic numbers: n is not palindromic in any base b with 2 ⩽ b ⩽ n-2. - N. J. A. Sloane. A100563 Number of bases less than sqrt(n) in which n is a palindrome. - Gordon Robert Hamilton

Kevin Brown informed me that he has more info about tetrahedral palindromes in other base representations.
Link to his article :
On General Palindromic Numbers

Alain Bex (email) sent me the first palindromic squares in base 12 - go to topic.

Dw (email) found several binary/decimal palindromes of record lengths - go to topic.

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Richard Gosiorovsky (email)
Also Palindromic in Base 16 (OEIS A029731)
[ do 7-8/3/2024 7:33 ]

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Dear Mr. De Geest,

I would like to ask you for updating the table re. numbers that are palindromic in bases 10 and 16.
I did some progress on it, and found 51 new members of the sequence. See indices 84 up to 134.
Full list of new members is in the text file in the attachment.

Thank you,

Richard Gosiorovsky, Bratislava

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When I asked Richard how he achieved his results he replied:

Richard

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Eshed Schacham's article can be found following this link:
https://ashdnazg.github.io/articles/22/Finding-Really-Big-Palindromes
As a software developer he also made public his .c code he wrote for this topic and explains the algorithm in great depth.

To my surprise he found 35 new decimal palindromes that are also palindromic in base 2 or binary.
I added them forthwith to my webpage. Please refer to indices 148 up to 183 in the very first
scrolltable of this very page. Impressive if you consider their record lengths.

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Richard Gosiorovsky (email)
Dual-base Palindromes
[ do 2/5/2024 6:02 ]

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Hi Patrick,

I am sending you in the attachment several
new records for dual-base palindromes:

base 10 & 3:    4 new records → From [71] to [74]
base 10 & 4:   35 new records → From [65] to [99]
base 10 & 5:  100 new records → From [84] to [183]
base 10 & 6:    9 new records → From [110] to [118]
base 10 & 7:    8 new records → From [74] to [81]
base 10 & 8:   43 new records → From [89] to [131]
base 10 & 9:    5 new records → From [71] to [75]
base 10 & 16:   9 new records → From [135] to [143]

Thank you for this interesting entertainment.

Richard

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Richard Gosiorovsky (email)
Dual-base Palindromes (bases 10 & 5)
[ do 5/8/2024 16:44 ]

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Hi Patrick, Hi Eshed,

I am here again, I would like to ask you for updating dual-base
palindrome sequence A029962 (bases 10 & 5), where I found 52 new
members (in the attachement). I improved algorithm a bit, but it
is still far from optimal. Changing bases to 10 & 2 I can not
achieve Eshed's records at all. Basic idea remains the same.

Richard

PS: For better understanding I am sending the source code too
(it uses GMP - GNU multiple precision library)

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Richard Gosiorovsky (email)
Dual-base Palindromes (bases 10 & 5)
[ do 30/10/2025 19:01 ]

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Hi Patrick,

I am sending you in the attachement 42 new members of OEIS sequence
A029962 (numbers simultaneously palindromic in bases 10 and 5).

base 10 & 5: 42 new records → From [236] to [277]

I used the same algorithm as the last time plus some optimization
and longer running time (two weeks).

Richard

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Richard Jones
Dual-base Palindromes (decimal & ternary)
[ do 5/4/2026 11:50 ]

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Submitted entries [75] up to [99] for the base 3 (ternary) case.

Being a number theorist, my coding skills are not exactly top level developer code.
I started looking at this problem trying to create a constructive algorithm for these numbers
as opposed to an exhaustive search approach - I am pretty sure the list I gave is exhaustive - but
I haven't proven it as of yet. R.

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Richard Jones
Dual-base Palindromes (decimal & ternary)
[ do 12/4/2026 22:40 ]

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Submitted entries [100] up to [110] for the base 3 (ternary) case.

A few new ones (decimal/ternary dual palindromes) all verified. R.

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Richard Jones
Dual-base Palindromes (decimal & ternary)
[ do 20/4/2026 21:08 ]

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Submitted entries [111] up to [117] for the base 3 (ternary) case.

This ends my search short of a number theoretic breakthrough - D=41 and 42 would just
take too long - this is a more difficult task than searching for decimal/binary where D=55
can be done in a couple of days or so. R.J.

The only one that really holds my interest is ternary/binary - also a difficult programming task -
current record has T=91 digits (T is ternary) - but Nikulshin states on OEIS they must have
checked T=93 as well. See Simultaneous palindromic in bases 2 and 3.That's actually quite
impressive since it was done over a decade ago on weaker hardware. There must be some
pruning trick I am missing though - just like him and Astrelin (now deceased) must have done
for their decimal/binary code - I know they go to 50 digits with that on old hardware - with
small memory - I know the Eshed code can run D=55 in a few days on modern hardware but that
runs into requiring tables of a large size which becomes impractical for D>55 - the Nikulshin
approach can use far smaller tables - in fact DRAM latency for large tables is a big factor in
limiting what you can do on realistic hardware. R.J.

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Richard Jones
Dual-base Palindromes (decimal & ternary)
[ zo 24/06/2026, 22:00 ]

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Submitted entries [118] up to [124] for the base 3 (ternary) case.

Have some new (D=41) decimal/ternary palindromes (seven).
Regards,

Richard

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Richard Jones
More dual-base Palindromes (decimal & ternary)
[ zo 24/06/2026, 22:00 ]

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Submitted entries [125] up to [131] for the base 3 (ternary) case.

I have finished doing decimal/ternary so that one value at D=45 is it for me -- the scaling has
finally worn out and the runs are getting too long - as I said a full D=45 run will take 11 days
which is not feasible for me.

So please note this D=45 is not an exhaustive list -- and all I can say is that the number above
is the smallest at D=45 --- I only found it because I was doing a quick run to determine
the time for a complete run and that one happened to pop out in the first 4 minutes of what
would be a 11 day run.

Regards,

Richard

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Richard Jones
More numbers:
[ vr 14/08/2026, 14:03 ]

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Submitted entries [132] up to [143] for the base 3 case (decimal/ternary).

Hi Patrick,

Also --- I gave you a single palindrome for decimal/ternary at D=45. I have done D=45 completely plus
D=46,47,48. (I have done D=49 and it was blank BUT there is a slight chance, which I am investigating,
that it could have missed solutions at D=49 or above so I am holding off, on declaring that finished).
…
…
So we have completed

dec/tern to D=48
and also
six/bin to S=80
tern/bin to T=115

Regards,

Richard

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Richard Jones
More decimal/ternary
[ vr 16/08/2026, 14:25 ]

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Submitted entries [144] up to [150] for the base 3 case (decimal/ternary).

Hi Patrick,

I did have a problem for missing solutions at D=49 and D=50 for decimal/ternary. All D up to and thru 48
were correct -- I had a parameter going silently out of bounds for D=49 and above.

All fixed now.

So instead of being empty - D=49 has 7 solutions:
…
…
But D=50 is genuinely empty. So the next solution is > 10^50

Regards,

Richard

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Richard Jones
decimal/ternary
[ wo 19/08/2026, 23:11 ]

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Hi Patrick,

…
…

I stopped decimal/ternary at D=50 --- that is a hard case to push further as well.

As I come to the end of these palindrome searches I hope I have been of some help -- it's fun trying to push a laptop
as far as I think is possible on brute force number crunching.

Regards,

Richard

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Richard Jones
Decimal/Base X duals
[ do 3/09/2026, 15:52 ]

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Hi Patrick,

I have done all the ones on your page that were not extended already by dedicated codes.

So I am attaching the solutions up to D=40 for the decimal/baseX for baseX = 4,6,7,8,9,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36 and 60.

Also -- here are the primes in each list with obvious notation:

…
…

All of the solutions were verified once in Rust and once in Mathematica --- all primes were verified by the ProvablePrime package for Mathematica.

I will probably extend these to D=45 some time.

Hope this helps.

Regards,

Richard

ps

If you have any problem with these being corrupted let me know and I'll send them individualy

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Richard Jones
I couldn't resist
[ do 3/09/2026, 20:26 ]

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Hi Patrick,

You have that gaping hole between base 36 and base 60 that says "missing tables planned for construction in the future"

Seems like an open goal for bases 37 to 59 and all in between.

So here they are all to D=40 digits.

Here are the primes in those lists:

…
…

There, lots of fun for you.

Regards,

Richard

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( © All rights reserved ) - Last modified : September 20, 2026.

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Patrick De Geest - Belgium - Short Bio - Some Pictures
E-mail address : pdg@worldofnumbers.com

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