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 A057182 Numbers n such that (16^n + 1)/17 is a prime. 19
 3, 5, 7, 23, 37, 89, 149, 173, 251, 307, 317, 30197, 1025393 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Paul Bourdelais, A Generalized Repunit Conjecture 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 Eric Weisstein's World of Mathematics, Ferrier's Prime MATHEMATICA m = 16; Select[Range[0, 10^3], PrimeQ[(m^# + 1)/(m + 1)] & ] (* Robert Price, Oct 15 2018 *) PROG (PRIME95) PRP=1, 2, 4101572, 1, 0, 0, "17" CROSSREFS Subsequence of A195439. [Arkadiusz Wesolowski, Dec 18 2011] Sequence in context: A154764 A320256 A101773 * A038916 A019363 A288890 Adjacent sequences:  A057179 A057180 A057181 * A057183 A057184 A057185 KEYWORD hard,more,nonn AUTHOR N. J. A. Sloane, Sep 15 2000 EXTENSIONS a(12) from Robert G. Wilson v, Apr 11 2005 a(13) gives a probable prime discovered by Paul Bourdelais, Aug 20 2014 STATUS approved

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Last modified December 14 09:41 EST 2019. Contains 329979 sequences. (Running on oeis4.)