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A106873 Primes of the form 2x^2-xy+4y^2, with x and y nonnegative. 1


%S 2,5,19,71,97,103,113,157,163,191,193,211,317,359,373,439,443,467,479,

%T 541,547,563,593,661,683,701,727,769,877,887,977,997,1033,1039,1093,

%U 1123,1151,1223,1229,1289,1399,1409,1423,1427,1459,1601,1609,1613

%N Primes of the form 2x^2-xy+4y^2, with x and y nonnegative.

%C Discriminant=-31.

%H Vincenzo Librandi and Ray Chandler, <a href="/A106873/b106873.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, 4, 10000] (* see A106856 *)

%Y Cf. A123064, A106872.

%K nonn,easy

%O 1,1

%A _T. D. Noe_, May 09 2005

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Last modified August 2 05:02 EDT 2021. Contains 346409 sequences. (Running on oeis4.)