A032395 Numbers k such that 91*2^k+1 is prime.

8, 168, 260, 696, 5028, 5536, 6668, 13388, 14220, 52776, 130140, 244520, 255020, 294708, 541128, 616072

Offset

1,1

Links

Table of n, a(n) for n=1..16.

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(91*2^n+1) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Sequence in context: A205567 A267205 A305096 * A316756 A294512 A090228

Adjacent sequences: A032392 A032393 A032394 * A032396 A032397 A032398

Keyword

nonn,hard

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

Status

approved