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A106899 Primes of the form 2x^2-xy+6y^2, with x and y nonnegative. 1


%S 2,7,53,89,97,131,263,331,337,353,479,491,521,541,643,709,719,883,911,

%T 1021,1093,1117,1229,1231,1427,1489,1493,1511,1531,1699,1787,1789,

%U 1907,1999,2063,2089,2129,2131,2399,2591,2621,2657,2707,2711,2791

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

%C Discriminant=-47.

%H Vincenzo Librandi and Ray Chandler, <a href="/A106899/b106899.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, 6, 10000] (* see A106856 *)

%K nonn,easy

%O 1,1

%A _T. D. Noe_, May 09 2005

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Last modified May 31 07:14 EDT 2020. Contains 334747 sequences. (Running on oeis4.)