A106873 Primes of the form 2x^2-xy+4y^2, with x and y nonnegative.

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

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