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

1,2

Links

Table of n, a(n) for n=1..35.

Prog

(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, ", ")))));

Crossrefs

Cf. A273945.

Sequence in context: A343231 A215934 A323895 * A347112 A227104 A171721

Adjacent sequences: A274505 A274506 A274507 * A274509 A274510 A274511

Keyword

nonn,more

Author

Arkadiusz Wesolowski, Jun 25 2016

Status

approved