A106874 Primes of the form x^2+xy+8y^2, with x and y nonnegative.

47, 67, 131, 149, 173, 227, 293, 349, 379, 431, 521, 577, 607, 617, 653, 811, 839, 853, 857, 919, 937, 971, 1031, 1063, 1187, 1213, 1237, 1259, 1303, 1327, 1451, 1493, 1559, 1583, 1619, 1663, 1721, 1723, 1741, 1879, 1931, 1973, 2003, 2017

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)

Programs

Mathematica

QuadPrimes2[1, 1, 8, 10000] (* see A106856 *)