A106948 Primes of the form x^2+xy+18y^2, with x and y nonnegative.

107, 293, 509, 647, 739, 971, 1013, 1039, 1123, 1217, 1361, 1367, 1373, 1423, 1663, 1811, 2083, 2099, 2239, 2309, 2351, 2657, 2677, 2917, 3181, 3343, 3517, 3533, 3539, 3623, 3671, 3803, 4003, 4079, 4253, 4483, 4691, 4957, 5273, 5581, 5783

Offset: 1

Author

T. D. Noe, May 09 2005

Keywords

• nonn
• easy

Comments

Discriminant=-71.

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, 18, 10000] (* see A106856 *)