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Primes of the form 2x^2-xy+7y^2, with x and y nonnegative.
1

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

%S 2,7,13,73,83,127,167,173,197,233,263,283,337,347,373,503,547,557,563,

%T 607,677,733,743,787,853,887,937,953,1033,1163,1187,1297,1327,1427,

%U 1487,1553,1583,1597,1723,1777,1847,1913,1933,1987,1993,1997,2053

%N Primes of the form 2x^2-xy+7y^2, with x and y nonnegative.

%C Discriminant=-55.

%H Vincenzo Librandi and Ray Chandler, <a href="/A106912/b106912.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[2, -1, 7, 10000] (* see A106856 *)

%K nonn,easy

%O 1,1

%A _T. D. Noe_, May 09 2005