A106938 Primes of the form 2x^2-2xy+9y^2, with x and y nonnegative.

2, 13, 89, 101, 137, 229, 257, 373, 389, 421, 433, 457, 557, 577, 701, 757, 761, 769, 773, 953, 1021, 1033, 1069, 1109, 1181, 1249, 1277, 1301, 1373, 1429, 1481, 1549, 1613, 1657, 1789, 1801, 1889, 1913, 1973, 1993, 1997, 2333, 2389, 2393, 2549

Offset: 1

Author

T. D. Noe, May 09 2005

Keywords

• nonn
• easy

Comments

Discriminant=-68.

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[2, -2, 9, 10000] (* see A106856 *)