OFFSET
1,3
COMMENTS
a(22) > 10^5. - Robert Price, Jan 10 2015
MATHEMATICA
Do[ If[ PrimeQ[2*10^n + 11], Print[n]], {n, 0, 4800}]
PROG
(PARI) is(n)=isprime(2*10^n+11) \\ Charles R Greathouse IV, Sep 27 2016
CROSSREFS
KEYWORD
hard,more,nonn
AUTHOR
Carl R. White, Aug 20 2003
EXTENSIONS
Edited and extended by Robert G. Wilson v, Aug 25 2003
Term a(13) (had been listed as 254) corrected by Jon E. Schoenfield, Jul 13 2010
a(17)-a(21) from Robert Price, Jan 10 2015
STATUS
approved