A106942 - OEIS

A106942

Primes of the form 3x^2+xy+6y^2, with x and y nonnegative.

3, 29, 103, 109, 191, 271, 409, 499, 503, 557, 587, 613, 1031, 1193, 1237, 1321, 1619, 1637, 1657, 1693, 1873, 1949, 2251, 2281, 2417, 2423, 2459, 2687, 2969, 3089, 3167, 3413, 3491, 3607, 3697, 3769, 3793, 3863, 3911, 4261, 4339, 4447

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

OFFSET

1,1

COMMENTS

Discriminant=-71.

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, 6, 10000] (* see A106856 *)

CROSSREFS

Sequence in context: A190942 A106943 A281712 * A211621 A100202 A094068

Adjacent sequences: A106939 A106940 A106941 * A106943 A106944 A106945

KEYWORD

nonn,easy

AUTHOR

T. D. Noe, May 09 2005

STATUS

approved