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A274509
a(n) is the only number m such that 5^(2^m) + 1 is divisible by A273946(n).
0
0, 1, 3, 7, 2, 5, 6, 4, 3, 9, 15, 13, 17, 11, 8, 19, 18, 11, 9, 4, 16, 5, 23, 24, 17, 19, 17, 5, 36, 6, 32, 23, 34, 40, 41, 39, 25
OFFSET
1,3
PROG
(PARI) forstep(p=3, 10^15, 2, if(!Mod(p, 5)==0, if(isprime(p), o=znorder(Mod(5, p)); x=ispower(2*o); if(2^(x-1)==o, print1(x-2, ", ")))));
CROSSREFS
Cf. A273946.
Sequence in context: A336893 A226521 A091723 * A016618 A130789 A023529
KEYWORD
nonn,more
AUTHOR
STATUS
approved