A258866 Numbers n such that n!! - 1024 is prime.

11, 17, 31, 39, 53, 93, 95, 381, 727, 867, 1229, 1573, 3161, 4293, 5635, 7077, 7093, 8861, 37401

Offset

1,1

Comments

Corresponding primes are 9371, 34458401, ... .

a(20) > 50000.

Links

Table of n, a(n) for n=1..19.

Joe McLean, Interesting Sources of Probable Primes

Mathematica

Select[Range[0, 50000], If[#!! - 1024 > 0, PrimeQ[#!! - 1024]] &]

Crossrefs

Cf. A006882, A007749, A094144, A123910, A258452, A258616, A262772.

Sequence in context: A211486 A208573 A142718 * A189324 A127703 A165667

Adjacent sequences: A258863 A258864 A258865 * A258867 A258868 A258869

Keyword

hard,more,nonn

Author

Robert Price, Nov 06 2015

Status

approved