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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 (list; graph; refs; listen; history; text; internal format)
 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. 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: A291277 A191375 A260793 * A322962 A075334 A056983 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

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Last modified October 23 09:45 EDT 2019. Contains 328345 sequences. (Running on oeis4.)