World!OfNumbers |
WON plate 124 | |
||||
---|---|---|---|---|---|

[ palindromesthat are pseudoprime to base 2 are
Can you extend the list with a few more terms ? Beware, it might be a tougher job than it appears at first... [ email dd. March 10, 2002 ]Shyam Sunder Gupta cracked the fourth palindromic psp(2). The number is 127665878878566721.( 7 * 11 * 19 * 41 * 73 * 137 * 271 * 577 * 1361 ) This is in fact not only psp(2) but psp in all bases i.e. it is a Carmichael Number and this is the second palindromic Carmichael number. Interestingly the sum of digits of this number is 100. [ October 19, 2002 ]Shyam Sunder Gupta (email) cracked the fifth palindromic psp(2). The number is 1037998220228997301.( 41 * 101 * 211 * 251 * 757 * 1321 * 4733 ) Unfortunately it is not a strong pseudoprime(base 2). Number Theory List - Message 20 Oct 2002 Anyone interested in finding the sixth palindromic psp(2) and/or the third palindromic Carmichael number ? | |||||

A000124 Prime Curios! Prime Puzzle Wikipedia 124 Le nombre 124 |

[ TOP OF PAGE]