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 A032408 Numbers k such that 117*2^k+1 is prime. 0
 3, 4, 6, 10, 16, 30, 36, 91, 94, 156, 382, 454, 643, 867, 1416, 2656, 2851, 5971, 6016, 7260, 9876, 15019, 43504, 53827, 88132, 149032, 153372, 207571, 223656, 258442, 344850, 403164, 946852, 1024380, 1035072, 1057032, 1157460, 2794014 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Table of n, a(n) for n=1..38. Ray Ballinger, Proth Search Page Ray Ballinger and Wilfrid Keller, List of primes k.2^n + 1 for k < 300 Y. Gallot, Proth.exe: Windows Program for Finding Large Primes Wilfrid Keller, List of primes k.2^n - 1 for k < 300 Index entries for sequences of n such that k*2^n-1 (or k*2^n+1) is prime MATHEMATICA Select[Range[1000], PrimeQ[117*2^# + 1] & ] (* Robert Price, Dec 17 2018 *) PROG (PARI) is(n)=ispseudoprime(117*2^n+1) \\ Charles R Greathouse IV, Jun 13 2017 CROSSREFS Sequence in context: A310005 A355325 A068922 * A347567 A018908 A353138 Adjacent sequences: A032405 A032406 A032407 * A032409 A032410 A032411 KEYWORD nonn,more AUTHOR James R. Buddenhagen EXTENSIONS Extended by Hugo Pfoertner, Jul 02 2003 a(28)-a(37) from the Ray Ballinger and Wilfrid Keller link by Robert Price, Dec 17 2018 a(38) from Jeppe Stig Nielsen, Feb 25 2020 STATUS approved

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Last modified June 5 12:07 EDT 2023. Contains 363136 sequences. (Running on oeis4.)