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Primes of the form 3x^2+xy+6y^2, with x and y nonnegative.
1

%I #17 Aug 05 2014 14:16:29

%S 3,29,103,109,191,271,409,499,503,557,587,613,1031,1193,1237,1321,

%T 1619,1637,1657,1693,1873,1949,2251,2281,2417,2423,2459,2687,2969,

%U 3089,3167,3413,3491,3607,3697,3769,3793,3863,3911,4261,4339,4447

%N Primes of the form 3x^2+xy+6y^2, with x and y nonnegative.

%C Discriminant=-71.

%H Vincenzo Librandi and Ray Chandler, <a href="/A106942/b106942.txt">Table of n, a(n) for n = 1..10000</a> [First 1000 terms from Vincenzo Librandi]

%H N. J. A. Sloane et al., <a href="https://oeis.org/wiki/Binary_Quadratic_Forms_and_OEIS">Binary Quadratic Forms and OEIS</a> (Index to related sequences, programs, references)

%t QuadPrimes2[3, 1, 6, 10000] (* see A106856 *)

%K nonn,easy

%O 1,1

%A _T. D. Noe_, May 09 2005