A057178 - OEIS (original) (raw)

A057178

Numbers k such that (12^k + 1)/13 is a prime.

17

5, 11, 109, 193, 1483, 11353, 21419, 21911, 24071, 106859, 139739, 495953

COMMENTS

(12^1483 + 1)/13, a 1600-digit number, has now been certified prime with Primo. - Rick L. Shepherd, May 01 2002

LINKS

J. Brillhart et al., Factorizations of b^n +- 1, Contemporary Mathematics, Vol. 22, Amer. Math. Soc., Providence, RI, 3rd edition, 2002.

Eric Weisstein's World of Mathematics, Repunit

EXTENSIONS

More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 05 2008

a(10) corresponds to a probable prime, discovered by Paul Bourdelais, Feb 08 2010

a(11) corresponds to a probable prime, discovered by Paul Bourdelais, Sep 21 2011

a(12) corresponds to a probable prime, discovered by Paul Bourdelais, Nov 13 2018