A106955 Primes of the form 4x^2-2xy+5y^2, with x and y nonnegative.

5, 7, 17, 43, 61, 131, 137, 149, 199, 233, 239, 251, 311, 359, 389, 397, 443, 463, 467, 499, 557, 577, 587, 617, 643, 647, 653, 691, 739, 761, 769, 809, 823, 859, 937, 997, 1069, 1109, 1163, 1277, 1279, 1289, 1373, 1423, 1429, 1453, 1489, 1559, 1613

Offset: 1

Author

T. D. Noe, May 09 2005

Keywords

• nonn
• easy

Comments

Discriminant=-76.

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, -2, 5, 10000] (* see A106856 *)