OFFSET
1,1
LINKS
Ray Ballinger, Proth Search Page
Ray Ballinger and Wilfrid Keller, List of primes k.2^n + 1 for k < 300
Chris K. Caldwell, The Prime Database: 31*2^4673544 + 1
Chris K. Caldwell, The Prime Database: 31*2^5560820 + 1
Wilfrid Keller, List of primes k.2^n - 1 for k < 300
PROG
(PARI) is(n)=ispseudoprime(31*2^n+1) \\ Charles R Greathouse IV, Jun 12 2017
CROSSREFS
KEYWORD
nonn,hard
AUTHOR
EXTENSIONS
a(12) from Jeppe Stig Nielsen, Oct 14 2019
a(13) from Jeppe Stig Nielsen, Jan 29 2020
STATUS
approved