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A153812 Primes p such that 6*p^2+1 is also prime. 3
5, 11, 59, 79, 89, 109, 131, 191, 199, 241, 269, 359, 389, 431, 439, 661, 691, 829, 859, 1019, 1109, 1181, 1249, 1319, 1439, 1621, 1759, 1789, 1831, 1949, 1979, 2011, 2081, 2111, 2179, 2341, 2371, 2389, 2441, 2459, 2671, 2699, 2861, 2999, 3169, 3229, 3251 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

EXAMPLE

For prime p = 199, 6*p^2+1 = 237607 is prime.

MATHEMATICA

Select[Prime[Range[500]], PrimeQ[(6 #^2 + 1)]&] (* Vincenzo Librandi, Apr 14 2013 *)

PROG

(MAGMA) [ p: p in PrimesUpTo(3300) | IsPrime(6*p^2+1) ];

CROSSREFS

Cf. A052291 (primes p such that 4p^2 + 1 is also prime).

Sequence in context: A091798 A070198 A121934 * A269454 A153209 A239026

Adjacent sequences:  A153809 A153810 A153811 * A153813 A153814 A153815

KEYWORD

nonn,easy

AUTHOR

Klaus Brockhaus, Jan 01 2009

STATUS

approved

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Last modified May 31 13:01 EDT 2020. Contains 334748 sequences. (Running on oeis4.)