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URL: https://oeis.org/A095688

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A095688
Numbers k such that 10^k + 13 is prime.
30
1, 2, 3, 17, 25, 81, 140, 142, 152, 280, 291, 406, 4209, 4785, 8474, 9550, 9596, 21773, 22352, 24938, 38428, 48526, 65426, 75441, 76705
OFFSET
1,2
COMMENTS
No other terms <= 100000. - Robert Price, Mar 03 2011
MATHEMATICA
lst={}; Do[If[PrimeQ[10^n+13], AppendTo[lst, n]], {n, 10^3}]; lst (* Vladimir Joseph Stephan Orlovsky, Aug 20 2008 *)
PROG
(PARI) for(n=1, 1e4, if(ispseudoprime(10^n+13), print1(n", "))) \\ Charles R Greathouse IV, Jul 19 2011
CROSSREFS
Cf. A095680 (the actual primes).
Sequence in context: A385243 A023214 A225946 * A029876 A248716 A228201
KEYWORD
nonn,more,hard
AUTHOR
Jason Earls, Jul 05 2004
EXTENSIONS
More terms from Ryan Propper, Sep 07 2005
5 more terms from Jason Earls, Feb 08 2008
a(23)=65426 from Robert Price, Jan 09 2011
a(24) and a(25) = 75441,76705 from Robert Price, Jan 29 2011
STATUS
approved