A106871 Primes of the form 2x^2+xy+4y^2, with x and y nonnegative.

2, 7, 41, 59, 101, 107, 109, 233, 257, 281, 307, 311, 397, 419, 421, 503, 599, 659, 691, 733, 751, 907, 1051, 1061, 1087, 1103, 1163, 1217, 1249, 1279, 1291, 1307, 1321, 1361, 1373, 1433, 1471, 1489, 1597, 1621, 1693, 1733, 1777, 1787, 1831

Offset: 1

Author

T. D. Noe, May 09 2005

Keywords

• nonn
• easy

Comments

Discriminant=-31.

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. A123064, A106872.

Programs

Mathematica

QuadPrimes2[2, 1, 4, 10000] (* see A106856 *)