A106868 Primes of the form 2x^2-xy+3y^2, with x and y nonnegative.

2, 3, 29, 31, 47, 73, 131, 151, 163, 193, 197, 233, 239, 277, 349, 353, 397, 487, 491, 499, 509, 547, 577, 601, 647, 653, 683, 811, 857, 859, 863, 929, 947, 1013, 1021, 1039, 1093, 1283, 1289, 1291, 1297, 1301, 1327, 1361, 1429, 1499, 1511, 1531

Offset: 1

Author

T. D. Noe, May 09 2005

Keywords

• nonn
• easy

Comments

Discriminant=-23.

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)

Crossrefs

Cf. A028929, A106867.

Programs

Mathematica

QuadPrimes2[2, -1, 3, 10000] (* see A106856 *)