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A106968 Primes of the form 3x^2-xy+7y^2, with x and y nonnegative. 1

%I

%S 3,7,17,29,31,109,127,167,173,191,241,349,359,373,383,409,431,443,479,

%T 509,523,547,617,619,673,691,727,839,853,857,863,911,953,991,1091,

%U 1163,1171,1187,1193,1213,1361,1439,1459,1489,1571,1607,1621,1663

%N Primes of the form 3x^2-xy+7y^2, with x and y nonnegative.

%C Discriminant=-83.

%H Vincenzo Librandi and Ray Chandler, <a href="/A106968/b106968.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[3, -1, 7, 10000] (* see A106856 *)

%K nonn,easy

%O 1,1

%A _T. D. Noe_, May 09 2005

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Last modified January 20 16:27 EST 2022. Contains 350472 sequences. (Running on oeis4.)