A106899 - OEIS

A106899

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

2, 7, 53, 89, 97, 131, 263, 331, 337, 353, 479, 491, 521, 541, 643, 709, 719, 883, 911, 1021, 1093, 1117, 1229, 1231, 1427, 1489, 1493, 1511, 1531, 1699, 1787, 1789, 1907, 1999, 2063, 2089, 2129, 2131, 2399, 2591, 2621, 2657, 2707, 2711, 2791

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

OFFSET

1,1

COMMENTS

Discriminant=-47.

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, -1, 6, 10000] (* see A106856 *)

CROSSREFS

Sequence in context: A118191 A005588 A106898 * A259530 A119772 A104084

Adjacent sequences: A106896 A106897 A106898 * A106900 A106901 A106902

KEYWORD

nonn,easy

AUTHOR

T. D. Noe, May 09 2005

STATUS

approved