A139896 - OEIS

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A139896

Primes of the form 8x^2+8xy+31y^2.

31, 47, 79, 127, 191, 263, 271, 311, 359, 367, 479, 503, 599, 607, 727, 743, 751, 823, 839, 887, 911, 967, 983, 1063, 1087, 1279, 1303, 1319, 1423, 1439, 1447, 1471, 1487, 1511, 1583, 1607, 1663, 1759, 1783, 1871, 1951, 1999, 2143, 2207, 2351

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

OFFSET

1,1

COMMENTS

Discriminant=-928. See A139827 for more information.

LINKS

Vincenzo Librandi and Ray Chandler, Table of n, a(n) for n = 1..10000 [First 1000 terms from Vincenzo Librandi]

N. J. A. Sloane et al., Binary Quadratic Forms and OEIS (Index to related sequences, programs, references)

FORMULA

The primes are congruent to {15, 31, 39, 47, 55, 79, 95, 119, 127, 135, 143, 159, 191, 215} (mod 232).

MATHEMATICA

QuadPrimes2[8, -8, 31, 10000] (* see A106856 *)

PROG

(Magma) [p: p in PrimesUpTo(3000) | p mod 232 in [15, 31, 39, 47, 55, 79, 95, 119, 127, 135, 143, 159, 191, 215]]; // Vincenzo Librandi, Jul 31 2012

CROSSREFS

Sequence in context: A075586 A033221 A127576 * A289839 A244601 A004224

Adjacent sequences: A139893 A139894 A139895 * A139897 A139898 A139899

KEYWORD

nonn,easy

AUTHOR

T. D. Noe, May 02 2008

STATUS

approved