A106923 Primes of the form 4x^2+xy+4y^2, with x and y nonnegative.

43, 109, 151, 331, 337, 499, 751, 757, 907, 919, 1117, 1201, 1303, 1471, 1549, 1789, 2053, 2137, 2143, 2221, 2311, 2473, 2647, 2713, 3049, 3259, 3301, 3361, 3607, 3697, 3943, 4099, 4363, 4447, 4621, 4783, 4789, 5209, 5527, 5623, 5653, 5737

Offset: 1

Author

T. D. Noe, May 09 2005

Keywords

• nonn
• easy

Comments

Discriminant=-63.

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)

Programs

Mathematica

QuadPrimes2[4, 1, 4, 10000] (* see A106856 *)