A106962 Primes of the form x^2+xy+20y^2, with x and y nonnegative.

83, 179, 223, 397, 479, 541, 563, 677, 727, 757, 811, 863, 907, 941, 967, 1103, 1277, 1289, 1433, 1489, 1523, 1553, 1867, 1889, 1993, 1997, 2011, 2039, 2311, 2341, 2383, 2459, 2551, 2579, 2633, 2647, 2917, 2999, 3271, 3373, 3469, 3739, 3797

Offset: 1

Author

T. D. Noe, May 09 2005

Keywords

• nonn
• easy

Comments

Discriminant=-79.

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[1, 1, 20, 10000] (* see A106856 *)