A175063 Primes p such that 5*p^2 + 5*p + 1 is also prime.

2, 3, 5, 7, 11, 13, 17, 19, 43, 61, 71, 73, 79, 101, 107, 109, 127, 131, 137, 139, 149, 151, 167, 191, 193, 239, 263, 269, 283, 311, 347, 373, 379, 389, 401, 433, 439, 443, 461, 479, 499, 541, 587, 641, 643, 659, 701, 719, 733, 773, 797, 821, 883, 887, 907, 919

Offset

1,1

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Formula

A090563 INTERSECT A000040. - R. J. Mathar, Jul 06 2010

Mathematica

Select[Prime[Range[200]], PrimeQ[5#^2+5#+1]&]  (* Harvey P. Dale, Feb 25 2011 *)

Crossrefs

Cf. A000040, A090563.

Sequence in context: A069090 A321150 A088415 * A248199 A198196 A139054

Adjacent sequences: A175060 A175061 A175062 * A175064 A175065 A175066

Keyword

nonn

Author

Vincenzo Librandi, Dec 20 2009

Extensions

Corrected title. - Joerg Arndt, Mar 11 2010

Status

approved