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A182583 Primes p such that (5p^2-1)/4 is also prime. 1
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 (list; graph; refs; listen; history; text; internal format)
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 A154319 A080114

Adjacent sequences:  A182580 A182581 A182582 * A182584 A182585 A182586

KEYWORD

nonn

AUTHOR

Zak Seidov, May 06 2012

STATUS

approved

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Last modified September 21 11:18 EDT 2019. Contains 327253 sequences. (Running on oeis4.)