A032408 Numbers k such that 117*2^k+1 is prime.

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

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