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A106936 Primes of the form 3x^2-2xy+6y^2, with x and y nonnegative. 1

%I #17 Aug 05 2014 14:16:29

%S 3,7,23,71,79,131,139,227,283,347,379,419,479,487,499,503,571,607,619,

%T 683,691,719,743,823,827,839,947,991,1031,1051,1091,1151,1163,1231,

%U 1303,1319,1439,1451,1459,1499,1559,1567,1627,1723,1831,2003,2011

%N Primes of the form 3x^2-2xy+6y^2, with x and y nonnegative.

%C Discriminant=-68.

%H Vincenzo Librandi and Ray Chandler, <a href="/A106936/b106936.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, -2, 6, 10000] (* see A106856 *)

%K nonn,easy

%O 1,1

%A _T. D. Noe_, May 09 2005

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Last modified September 17 05:28 EDT 2024. Contains 375985 sequences. (Running on oeis4.)