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, 4632990

Offset

1,1

Links

Table of n, a(n) for n=1..39.

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: A355325 A068922 A375382 * 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

a(39) from Jeppe Stig Nielsen, Dec 23 2024

Status

approved