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URL: https://oeis.org/A057179

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A057179
Numbers n such that (13^n + 1)/14 is a prime.
16
3, 11, 17, 19, 919, 1151, 2791, 9323, 56333, 1199467
OFFSET
1,1
LINKS
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.
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: A291277 A191375 A260793 * A322962 A075334 A056983
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