A106911 Primes of the form 2x^2+xy+7y^2, with x and y any integer.

2, 7, 13, 17, 43, 73, 83, 107, 127, 167, 173, 193, 197, 227, 233, 263, 277, 283, 293, 307, 337, 347, 373, 457, 503, 523, 547, 557, 563, 593, 607, 613, 673, 677, 733, 743, 787, 827, 853, 857, 877, 887, 937, 953, 967, 997, 1033, 1063, 1097, 1117, 1163

Offset

1,1

Comments

Discriminant=-55.

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

Union[QuadPrimes2[2, 1, 7, 10000], QuadPrimes2[2, -1, 7, 10000]] (* see A106856 *)

Crossrefs

Sequence in context: A094516 A105883 A191036 * A019370 A356107 A001966

Adjacent sequences: A106908 A106909 A106910 * A106912 A106913 A106914

Keyword

nonn,easy

Author

T. D. Noe, May 09 2005

Status

approved