A106894 Primes of the form 3x^2+xy+4y^2, with x and y nonnegative.

3, 71, 101, 103, 239, 277, 307, 401, 457, 571, 617, 733, 853, 929, 1051, 1153, 1223, 1259, 1283, 1301, 1381, 1471, 1669, 1747, 1889, 1933, 2027, 2029, 2039, 2237, 2377, 2411, 2659, 2683, 2693, 2729, 2857, 2909, 3011, 3167, 3181, 3299, 3343

Offset: 1

Author

T. D. Noe, May 09 2005

Keywords

• nonn
• easy

Comments

Discriminant=-47.

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[3, 1, 4, 10000] (* see A106856 *)