A032375 Numbers k such that 51*2^k+1 is prime.

1, 3, 7, 9, 13, 17, 25, 43, 53, 83, 89, 92, 119, 175, 187, 257, 263, 267, 321, 333, 695, 825, 1485, 1917, 2660, 2967, 3447, 3659, 4121, 5225, 7377, 8543, 9584, 10707, 18032, 18465, 20733, 20807, 26703, 45541, 59217, 68956, 73571, 103664, 140504, 142327, 156443

Offset

1,2

Links

Jeppe Stig Nielsen, Table of n, a(n) for n = 1..60

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

Prog

(PARI) is(n)=ispseudoprime(51*2^n+1) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Sequence in context: A284894 A020497 A023490 * A089556 A225495 A111223

Adjacent sequences: A032372 A032373 A032374 * A032376 A032377 A032378

Keyword

nonn

Author

James R. Buddenhagen

Extensions

More terms from Hugo Pfoertner, Jun 20 2003

More terms (from http://web.archive.org/web/20161028080239/http://www.prothsearch.net/riesel.html), Joerg Arndt, Apr 07 2013

Terms moved from Data section to b-files, and more terms appended to b-file, by Jeppe Stig Nielsen, Jan 18 2020

Status

approved