

A057184


Numbers n such that (18^n + 1)/19 is a prime.


14




OFFSET

1,1


LINKS

Table of n, a(n) for n=1..10.
J. Brillhart et al., Factorizations of b^n + 1, Contemporary Mathematics, Vol. 22, Amer. Math. Soc., Providence, RI, 3rd edition, 2002.
H. Dubner and T. Granlund, Primes of the Form (b^n+1)/(b+1), J. Integer Sequences, 3 (2000), #P00.2.7.
H. Lifchitz, Mersenne and Fermat primes field
Paul Bourdelais,A Generalized Repunit Conjecture


CROSSREFS

Sequence in context: A191638 A148704 A283109 * A148705 A148706 A148707
Adjacent sequences: A057181 A057182 A057183 * A057185 A057186 A057187


KEYWORD

nonn


AUTHOR

N. J. A. Sloane, Sep 15 2000


EXTENSIONS

a(10) = 481147 corresponds to a probable prime, which was found using PFGW v3.3.1.  Paul Bourdelais, Jul 27 2011


STATUS

approved



