A106968 - OEIS

A106968

Primes of the form 3x^2-xy+7y^2, with x and y nonnegative.

3, 7, 17, 29, 31, 109, 127, 167, 173, 191, 241, 349, 359, 373, 383, 409, 431, 443, 479, 509, 523, 547, 617, 619, 673, 691, 727, 839, 853, 857, 863, 911, 953, 991, 1091, 1163, 1171, 1187, 1193, 1213, 1361, 1439, 1459, 1489, 1571, 1607, 1621, 1663

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

OFFSET

1,1

COMMENTS

Discriminant=-83.

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[3, -1, 7, 10000] (* see A106856 *)

CROSSREFS

Sequence in context: A076033 A029519 A045424 * A191081 A079779 A083991

Adjacent sequences: A106965 A106966 A106967 * A106969 A106970 A106971

KEYWORD

nonn,easy

AUTHOR

T. D. Noe, May 09 2005

STATUS

approved