A106873 - OEIS

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A106873

Primes of the form 2x^2-xy+4y^2, with x and y nonnegative.

1

2, 5, 19, 71, 97, 103, 113, 157, 163, 191, 193, 211, 317, 359, 373, 439, 443, 467, 479, 541, 547, 563, 593, 661, 683, 701, 727, 769, 877, 887, 977, 997, 1033, 1039, 1093, 1123, 1151, 1223, 1229, 1289, 1399, 1409, 1423, 1427, 1459, 1601, 1609, 1613

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

OFFSET

1,1

COMMENTS

Discriminant=-31.

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, 4, 10000] (* see A106856 *)

CROSSREFS

Cf. A123064, A106872.

Sequence in context: A047022 A148436 A148437 * A014273 A255541 A150026

Adjacent sequences: A106870 A106871 A106872 * A106874 A106875 A106876

KEYWORD

nonn,easy

AUTHOR

T. D. Noe, May 09 2005

STATUS

approved