A175063 - OEIS

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A175063

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

2

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

(list; graph; refs; listen; history; text; internal format)

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