5*(107-1)/9 - 4*106 - 4*103 - 4
Using Pari/gp (< 1s)
     gp > isprime(5*(10^7-1)/9-4*10^6-4*10^3-4)
     %1 = 1


5*(1019-1)/9 - 4*1018 - 4*109 - 4
Using Pari/gp (< 1s)
     gp > isprime(5*(10^19-1)/9-4*10^18-4*10^9-4)
     %1 = 1


5*(1067-1)/9 - 4*1066 - 4*1033 - 4
Using Pari/gp (< 1s)
     gp > isprime(5*(10^67-1)/9-4*10^66-4*10^33-4)
     %1 = 1


5*(10259-1)/9 - 4*10258 - 4*10129 - 4
Using Pari/gp (time = 954 ms)
     gp > default(parisizemax,"1G")
     gp > isprime(5*(10^259-1)/9-4*10^258-4*10^129-4)
     %1 = 1


5*(10991-1)/9 - 4*10990 - 4*10495 - 4
Using Pari/gp (time = 1min, 11,547 ms)
     gp > default(parisizemax,"1G")
     gp > isprime(5*(10^991-1)/9-4*10^990-4*10^495-4)
     %1 = 1


5*(108525-1)/9 - 4*108524 - 4*104262 - 4
C:\pfgw>pfgw64 -q"5*(10^8525-1)/9-4*10^8524-4*10^4262-4"
PFGW Version 4.0.4.64BIT.20221214.Win_Dev [GWNUM 30.11]

5*(10^8525-1)/9-4*10^8524-4*10^4262-4 is 3-PRP! (0.5779s+0.0003s)


5*(1027533-1)/9 - 4*1027532 - 4*1013766 - 4
C:\pfgw>pfgw64 -q"5*(10^27533-1)/9-4*10^27532-4*10^13766-4"
PFGW Version 4.0.4.64BIT.20221214.Win_Dev [GWNUM 30.11]

5*(10^27533-1)/9-4*10^27532-4*10^13766-4 is 3-PRP! (3.8914s+0.0006s)
 

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