

A057179


Numbers n such that (13^n + 1)/14 is a prime.


15




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
P. Bourdelais,A Generalized Repunit Conjecture


MATHEMATICA

Select[Range@ 1500, PrimeQ[(13^# + 1)/14] &] (* Michael De Vlieger, Dec 15 2015 *)


PROG

(Prime95) PRP=1, 13, 1199467, 1, 0, 0, "14"
(PARI) is(n) = ispseudoprime((13^n + 1)/14); \\ Altug Alkan, Dec 14 2015


CROSSREFS

Sequence in context: A033200 A191375 A260793 * A075334 A056983 A175073
Adjacent sequences: A057176 A057177 A057178 * A057180 A057181 A057182


KEYWORD

nonn


AUTHOR

N. J. A. Sloane, Sep 15 2000


EXTENSIONS

a(9) corresponds to a probable prime discovered by Paul Bourdelais, Mar 18 2010
a(10) corresponds to a probable prime discovered by Paul Bourdelais, Dec 14 2015


STATUS

approved



