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A258866
Numbers n such that n!! - 1024 is prime.
1
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.
MATHEMATICA
Select[Range[0, 50000], If[#!! - 1024 > 0, PrimeQ[#!! - 1024]] &]
KEYWORD
hard,more,nonn
AUTHOR
Robert Price, Nov 06 2015
STATUS
approved