A125632 Smallest prime p such that 13^n divides p^12 - 1.

2, 19, 239, 239, 220861, 7654109, 533810141, 533810141, 822557039, 38050596989, 2395794301259, 58713568184837, 358661570404751, 22771419458231473, 65106791321062951, 1951482088631313647, 13942901952235522979

Offset

1,1

Links

Table of n, a(n) for n=1..17.

W. Keller and J. Richstein Fermat quotients that are divisible by p.

Prog

(PARI) See A125609

Crossrefs

Cf. A125609 = Smallest prime p such that 3^n divides p^2 - 1. Cf. A125610 = Smallest prime p such that 5^n divides p^4 - 1. Cf. A125611 = Smallest prime p such that 7^n divides p^6 - 1. Cf. A125612 = Smallest prime p such that 11^n divides p^10 - 1. Cf. A125633 = Smallest prime p such that 17^n divides p^16 - 1. Cf. A125634 = Smallest prime p such that 19^n divides p^18 - 1. Cf. A125635 = Smallest prime p such that 257^n divides p^256 - 1.

Sequence in context: A024227 A106945 A211886 * A124125 A234505 A239108

Adjacent sequences: A125629 A125630 A125631 * A125633 A125634 A125635

Keyword

hard,nonn

Author

Alexander Adamchuk, Nov 28 2006

Extensions

More terms from Martin Fuller, Jan 11 2007

Status

approved