A106869 Primes of the form x^2+xy+6y^2, with x and y nonnegative.

59, 101, 167, 173, 223, 271, 307, 317, 347, 449, 463, 593, 599, 607, 691, 719, 809, 821, 877, 883, 991, 997, 1097, 1117, 1151, 1181, 1231, 1319, 1451, 1453, 1553, 1613, 1669, 1697, 1787, 1789, 1871, 1889, 1913, 2027, 2053, 2143, 2339, 2347

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[1, 1, 6, 10000] (* see A106856 *)