A274508 a(n) is the only number m such that 3^(2^m) + 1 is divisible by A273945(n).

1, 3, 2, 3, 7, 8, 10, 15, 7, 15, 11, 8, 19, 4, 9, 21, 10, 11, 10, 26, 28, 9, 29, 32, 31, 38, 9, 39, 34, 21, 7, 31, 26, 36, 5

Offset: 1

Author

Arkadiusz Wesolowski, Jun 25 2016

Keywords

• nonn
• more

Crossrefs

Cf. A273945.

Programs

PARI

forstep(p=3, 10^15, 2, if(!Mod(p, 3)==0, if(isprime(p), o=znorder(Mod(3, p)); x=ispower(2*o); if(2^(x-1)==o, print1(x-2, ", ")))));