A106951 Primes of the form 3x^2+3xy+7y^2, with x and y nonnegative.

3, 7, 13, 37, 43, 67, 73, 97, 127, 193, 223, 277, 283, 337, 367, 373, 397, 433, 457, 463, 487, 523, 547, 577, 607, 613, 643, 727, 733, 787, 823, 853, 877, 883, 907, 937, 967, 997, 1033, 1087, 1123, 1153, 1213, 1297, 1303, 1327, 1423, 1447, 1453, 1483

Offset: 1

Author

T. D. Noe, May 09 2005

Keywords

• nonn
• easy

Comments

Discriminant=-75.

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, 3, 7, 10000] (* see A106856 *)