7*(1011-1)/9 - 6*1010 - 6*105 - 6
Using Pari/gp (< 1s)
     gp > isprime(7*(10^11-1)/9-6*10^10-6*10^5-6)
     %1 = 1


7*(1047-1)/9 - 6*1046 - 6*1023 - 6
Using Pari/gp (< 1s)
     gp > isprime(7*(10^47-1)/9-6*10^46-6*10^23-6)
     %1 = 1


7*(10635-1)/9 - 6*10634 - 6*10317 - 6
Using Pari/gp (time = 12,063 ms)
     gp > default(parisizemax,"1G")
     gp > isprime(7*(10^635-1)/9-6*10^634-6*10^317-6)
     %1 = 1


7*(10887-1)/9 - 6*10886 - 6*10443 - 6
Using Pari/gp (1min, 2,672 ms)
     gp > default(parisizemax,"1G")
     gp > isprime(7*(10^887-1)/9-6*10^886-6*10^443-6)
     %1 = 1









 

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