A106860 - OEIS

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A106860

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

2, 3, 17, 47, 53, 113, 167, 197, 227, 233, 263, 317, 383, 443, 557, 563, 587, 593, 677, 683, 773, 827, 863, 887, 947, 977, 1013, 1097, 1103, 1163, 1187, 1193, 1217, 1367, 1373, 1433, 1583, 1607, 1613, 1667, 1697, 1733, 1823, 1847, 1907, 1973, 2063

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

OFFSET

1,1

COMMENTS

Discriminant=-15.

LINKS

Rick L. Shepherd, Table of n, a(n) for n = 1..10000 [The first 1000 terms were found by Vincenzo Librandi]

N. J. A. Sloane et al., Binary Quadratic Forms and OEIS (Index to related sequences, programs, references)

MATHEMATICA

QuadPrimes2[2, -1, 2, 1000000] (* see A106856 *)

CROSSREFS

Sequence in context: A067976 A154316 A051084 * A042699 A078983 A235617

Adjacent sequences: A106857 A106858 A106859 * A106861 A106862 A106863

KEYWORD

nonn,easy

AUTHOR

T. D. Noe, May 09 2005

STATUS

approved