login
A032395
Numbers k such that 91*2^k+1 is prime.
0
8, 168, 260, 696, 5028, 5536, 6668, 13388, 14220, 52776, 130140, 244520, 255020, 294708, 541128, 616072
OFFSET
1,1
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
KEYWORD
nonn,hard
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