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%I #17 Aug 05 2014 14:16:29
%S 23,41,83,131,193,199,227,229,277,293,397,401,521,557,607,659,701,739,
%T 751,773,787,811,983,1013,1019,1061,1117,1231,1289,1409,1423,1427,
%U 1447,1511,1523,1531,1553,1667,1669,1693,1709,1723,1747,1753,1847
%N Primes of the form x^2-xy+21y^2, with x and y nonnegative.
%C Discriminant=-83.
%H Vincenzo Librandi and Ray Chandler, <a href="/A106970/b106970.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[1, -1, 21, 10000] (* see A106856 *)
%K nonn,easy
%O 1,1
%A _T. D. Noe_, May 09 2005
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