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(109*2^n+1) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
KEYWORD
nonn,hard,more
AUTHOR
EXTENSIONS
a(11)-a(13) from http://www.prothsearch.com/riesel1.html by Robert Price, Dec 14 2018
a(14) from Jeppe Stig Nielsen, Apr 04 2020
STATUS
approved