OFFSET
1,1
COMMENTS
Conjectured to be always a prime. But which primes are these? It would be nice to know of some other property that distinguishes these primes. See also the "blog" in A166133.
LINKS
Ray Chandler, Table of n, a(n) for n = 1..3258
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Apr 03 2015
STATUS
approved