OFFSET

1,1

LINKS

Ray Ballinger, Proth Search Page

Ray Ballinger and Wilfrid Keller, List of primes k.2^n + 1 for k < 300

Wilfrid Keller, List of primes k.2^n - 1 for k < 300

PROG

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

CROSSREFS

KEYWORD

nonn,hard

AUTHOR

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