login
A086865
Numbers n such that 2*10^n+11 is prime.
1
0, 1, 2, 3, 4, 9, 19, 25, 39, 63, 133, 157, 274, 943, 1009, 1353, 7297, 16221, 25256, 30424, 52147
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
Cf. A081677.
Sequence in context: A014281 A220364 A243902 * A258274 A228126 A352197
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