A165616 Primes of the form (p^2 - 1)/16 - p, where p is also a prime.

29, 311, 491, 881, 2089, 3331, 3389, 6761, 9649, 20231, 34499, 36191, 47629, 66431, 81649, 93479, 103841, 133769, 136711, 151901, 191621, 195581, 216919, 302221, 416989, 448561, 459341, 475751, 521641, 532531, 574939, 715289, 955991, 1076921

Offset

1,1

Links

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

Example

29 = (31^2-1)/16-31. 311 = (79^2-1)/16-79. 491 = (97^2-1)/16-97.

Mathematica

Select[Table[(p^2 - 1)/16 - p, {p, Prime[Range[300]]}], PrimeQ] (* Vincenzo Librandi, Oct 12 2012 *)

Crossrefs

Cf. A165615.

Sequence in context: A146015 A163708 A147831 * A142380 A042632 A107966

Adjacent sequences: A165613 A165614 A165615 * A165617 A165618 A165619

Keyword

nonn,easy

Author

Vincenzo Librandi, Sep 22 2009

Extensions

9649 inserted and sequence extended by R. J. Mathar, Oct 16 2009

Status

approved