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 A205796 Numbers n such that 4*17^n - 1 is prime. 0
 1, 9, 33, 69, 427, 1009, 2667 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS MATHEMATICA Table[If[PrimeQ[4*17^n-1], Print[n]; n], {n, 1, 20000}] PROG (PARI) is(n)=ispseudoprime(4*17^n-1) \\ Charles R Greathouse IV, Jun 13 2017 CROSSREFS Cf. A180431 (numbers n such that 4*17^n + 1 is prime). Cf. A205521 (numbers n such that 4*11^n - 1 is prime). Cf. A046865 (numbers n such that 4*5^n - 1 is prime). Cf. A005540 (numbers n such that 4*3^n - 1 is prime). Sequence in context: A145923 A092562 A103602 * A081585 A227221 A273316 Adjacent sequences:  A205793 A205794 A205795 * A205797 A205798 A205799 KEYWORD nonn AUTHOR José María Grau Ribas, Jan 31 2012 STATUS approved

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Last modified January 22 19:44 EST 2020. Contains 331153 sequences. (Running on oeis4.)