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A165615

Primes p such that (p^2-1)/16-p is also a prime number.

31, 79, 97, 127, 191, 239, 241, 337, 401, 577, 751, 769, 881, 1039, 1151, 1231, 1297, 1471, 1487, 1567, 1759, 1777, 1871, 2207, 2591, 2687, 2719, 2767, 2897, 2927, 3041, 3391, 3919, 4159, 4271, 4481, 4591, 4721, 4817, 5231, 5279, 5407, 5711, 6257, 6337, 6449

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OFFSET

1,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

EXAMPLE

For p=31, (31^2-1)/16-31 = 29 = A165615(1).

For p=79, (79^2-1)/16-79 = 311 = A165616(2).

MATHEMATICA

Select[Prime[Range[1000]], PrimeQ[(#^2-1)/16-# ]&] (* Harvey P. Dale, Oct 02 2009 *)

CROSSREFS

Cf. A165616.