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Primes of the form 5x^2+xy+5y^2, with x and y nonnegative.
2

%I #17 Aug 05 2014 14:16:30

%S 5,11,53,71,89,137,191,257,311,353,389,419,443,467,521,647,683,797,

%T 863,929,977,1013,1049,1103,1109,1181,1301,1367,1373,1499,1511,1637,

%U 1721,1901,1907,2003,2099,2237,2267,2333,2381,2423,2447,2531,2663

%N Primes of the form 5x^2+xy+5y^2, with x and y nonnegative.

%C Discriminant=-99.

%H Vincenzo Librandi and Ray Chandler, <a href="/A107009/b107009.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[5, 1, 5, 10000] (* see A106856 *)

%K nonn,easy

%O 1,1

%A _T. D. Noe_, May 09 2005