OFFSET
1,1
EXAMPLE
a(2) = 23 because A109217(23) = 1101111011111101111111 is prime.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Jason Earls, Jun 22 2005
EXTENSIONS
Terms corrected by Jinyuan Wang, Mar 22 2020
a(13)-a(14) from Michael S. Branicky, Mar 19 2024
STATUS
approved