A107005 - OEIS

A107005

Primes of the form 4x^2+4xy+7y^2, with x and y nonnegative.

7, 31, 79, 103, 127, 199, 223, 271, 367, 439, 463, 607, 631, 823, 919, 967, 991, 1087, 1231, 1279, 1303, 1327, 1423, 1447, 1543, 1567, 1663, 1831, 1879, 1951, 1999, 2143, 2239, 2311, 2383, 2503, 2551, 2719, 2791, 2887, 3079, 3271, 3319, 3391

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

OFFSET

1,1

COMMENTS

Discriminant=-96.

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)

MATHEMATICA

QuadPrimes2[4, 4, 7, 10000] (* see A106856 *)

CROSSREFS

Sequence in context: A304163 A003550 A107006 * A201477 A164621 A202254

Adjacent sequences: A107002 A107003 A107004 * A107006 A107007 A107008

KEYWORD

nonn,easy

AUTHOR

T. D. Noe, May 09 2005

STATUS

approved