A106905 - OEIS

A106905

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

2, 7, 11, 19, 31, 47, 67, 71, 83, 151, 223, 227, 239, 271, 307, 359, 379, 383, 431, 463, 479, 487, 499, 587, 619, 631, 643, 683, 691, 739, 743, 839, 863, 947, 967, 983, 1019, 1051, 1087, 1151, 1163, 1259, 1279, 1307, 1319, 1367, 1399, 1423, 1451, 1471

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

OFFSET

1,1

COMMENTS

Discriminant=-52.

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[2, 2, 7, 10000] (* see A106856 *)

CROSSREFS

Sequence in context: A084619 A236478 A106906 * A344141 A344142 A338340

Adjacent sequences: A106902 A106903 A106904 * A106906 A106907 A106908

KEYWORD

nonn,easy

AUTHOR

T. D. Noe, May 09 2005

STATUS

approved