OFFSET
1,2
COMMENTS
a(1) through a(16) have been proved to be prime with WinPFGW. a(16) has 5495 digits. No more terms up to 11700.
Results were computed using the PrimeFormGW (PFGW) primality-testing program. - Hugo Pfoertner, Nov 14 2019
EXAMPLE
a(5)=19 because 111111 * 2^19 + 1 = 58254163969, a prime.
CROSSREFS
KEYWORD
more,nonn,base
AUTHOR
Jason Earls, Jul 13 2004
STATUS
approved