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A106868 Primes of the form 2x^2-xy+3y^2, with x and y nonnegative. 1


%S 2,3,29,31,47,73,131,151,163,193,197,233,239,277,349,353,397,487,491,

%T 499,509,547,577,601,647,653,683,811,857,859,863,929,947,1013,1021,

%U 1039,1093,1283,1289,1291,1297,1301,1327,1361,1429,1499,1511,1531

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

%C Discriminant=-23.

%H Vincenzo Librandi and Ray Chandler, <a href="/A106868/b106868.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, 3, 10000] (* see A106856 *)

%Y Cf. A028929, A106867.

%K nonn,easy

%O 1,1

%A _T. D. Noe_, May 09 2005

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Last modified October 18 06:27 EDT 2021. Contains 348065 sequences. (Running on oeis4.)