A106883 Primes of the form 3x^2+3xy+4y^2, with x and y nonnegative.

3, 61, 79, 127, 199, 283, 313, 433, 571, 601, 727, 757, 829, 883, 919, 937, 1069, 1093, 1213, 1291, 1297, 1531, 1609, 1663, 1699, 1741, 1777, 2053, 2083, 2089, 2161, 2239, 2341, 2383, 2677, 2707, 2713, 2731, 2887, 3019, 3169, 3301, 3319

Offset: 1

Author

T. D. Noe, May 09 2005

Keywords

• nonn
• easy

Comments

Discriminant=-39.

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[3, 3, 4, 10000] (* see A106856 *)