A182583 Primes p such that (5p^2-1)/4 is also prime.

3, 5, 7, 11, 13, 23, 29, 31, 43, 53, 61, 71, 73, 89, 109, 127, 139, 149, 163, 229, 257, 263, 271, 277, 307, 331, 337, 383, 389, 419, 433, 449, 457, 463, 479, 523, 541, 607, 631, 643, 647, 653, 661, 673, 691, 727, 761, 769, 797, 809, 821, 823, 829, 859, 881

Offset

1,1

Links

Zak Seidov, Table of n, a(n) for n = 1..1000

Formula

a(n) = 2*A104012(n) + 1.

Mathematica

Select[Prime[Range[200]], PrimeQ[(5*#^2 - 1)/4] &]  (* T. D. Noe, May 07 2012 *)

Crossrefs

Cf. A104012.

Sequence in context: A240476 A040140 A066651 * A181741 A350401 A154319

Adjacent sequences: A182580 A182581 A182582 * A182584 A182585 A182586

Keyword

nonn

Author

Zak Seidov, May 06 2012

Status

approved