A033239 Primes of form x^2+61*y^2.

61, 97, 257, 269, 293, 317, 461, 613, 773, 977, 1033, 1097, 1201, 1217, 1601, 1613, 1669, 1721, 1993, 1997, 2221, 2269, 2309, 2549, 2557, 2657, 2969, 3001, 3037, 3049, 3089, 3253, 3313, 3389, 3461, 3877

Offset: 1

Author

N. J. A. Sloane

Keywords

• nonn
• easy

References

• David A. Cox, "Primes of the Form x^2 + n y^2", Wiley, 1989.

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, 0, 61, 10000] (* see A106856 *)