A106880 Primes of the form x^2+xy+9y^2, with x and y nonnegative.

11, 29, 71, 109, 149, 151, 179, 191, 211, 239, 281, 331, 359, 379, 389, 401, 421, 449, 491, 499, 541, 571, 599, 631, 641, 659, 701, 739, 751, 809, 821, 911, 919, 991, 1009, 1019, 1031, 1051, 1129, 1171, 1201, 1229, 1289, 1381, 1409, 1429, 1439, 1451

Offset: 1

Author

T. D. Noe, May 09 2005

Keywords

• nonn
• easy

Comments

Discriminant=-35.

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. A106881.

Programs

Mathematica

QuadPrimes2[1, 1, 9, 10000] (* see A106856 *)