2*(1011-1)/9 + 7*1010 + 7*105 + 7
Using Pari/gp (< 1s)
     gp > isprime(2*(10^11-1)/9+7*10^10+7*10^5+7)
     %1 = 1


2*(1019-1)/9 + 7*1018 + 7*109 + 7
Using Pari/gp (< 1s)
     gp > isprime(2*(10^19-1)/9+7*10^18+7*10^9+7)
     %1 = 1


2*(1055-1)/9 + 7*1054 + 7*1027 + 7
Using Pari/gp (< 1s)
     gp > isprime(2*(10^55-1)/9+7*10^54+7*10^27+7)
     %1 = 1


2*(10407-1)/9 + 7*10406 + 7*10203 + 7
Using Pari/gp (time = 2,094 ms)
     gp > default(parisizemax,"1G")
     gp > isprime(2*(10^407-1)/9+7*10^406+7*10^203+7)
     %1 = 1


2*(104139-1)/9 + 7*104138 + 7*102069 + 7
C:\pfgw>pfgw64 -q"2*(10^4139-1)/9+7*10^4138+7*10^2069+7"
PFGW Version 4.0.4.64BIT.20221214.Win_Dev [GWNUM 30.11]

2*(10^4139-1)/9+7*10^4138+7*10^2069+7 is 3-PRP! (0.0836s+0.0007s)


2*(1012751-1)/9 + 7*1012750 + 7*106375 + 7
C:\pfgw>pfgw64 -q"2*(10^12751-1)/9+7*10^12750+7*10^6375+7"
PFGW Version 4.0.4.64BIT.20221214.Win_Dev [GWNUM 30.11]

2*(10^12751-1)/9+7*10^12750+7*10^6375+7 is 3-PRP! (0.8555s+0.0007s)
 

[up TOP OF PAGE]

( © All rights reserved ) - Last modified : April 1, 2023.
Patrick De Geest - Belgium flag - Short Bio - Some Pictures
E-mail address : pdg@worldofnumbers.com