OFFSET
1,2
COMMENTS
a(9) > 11500. - Jinyuan Wang, Mar 19 2020
PROG
(Magma) [k: k in [1..500] | IsPrime(4^k*(2^k-1)+1)]; // Jinyuan Wang, Mar 19 2020
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Pierre CAMI, Oct 11 2004
EXTENSIONS
6348, corresponding to a probable prime, from Ryan Propper, Jun 18 2005
Edited by T. D. Noe, Oct 30 2008
a(9)-a(12) from Michael S. Branicky, Aug 17 2024
STATUS
approved