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A106991 Primes of the form 5x^2-5xy+6y^2, with x and y nonnegative. 1

%I

%S 5,19,191,199,251,349,491,709,739,809,929,1151,1201,1289,1429,1451,

%T 1559,1619,1621,2039,2129,2281,2341,2551,2591,2741,2819,2861,3019,

%U 3329,3391,3539,3581,3769,3919,3931,4091,4129,4519,4831,4861,4889

%N Primes of the form 5x^2-5xy+6y^2, with x and y nonnegative.

%C Discriminant=-95.

%H Vincenzo Librandi and Ray Chandler, <a href="/A106991/b106991.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[5, -5, 6, 10000] (* see A106856 *)

%K nonn,easy

%O 1,1

%A _T. D. Noe_, May 09 2005

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Last modified September 28 01:27 EDT 2021. Contains 347698 sequences. (Running on oeis4.)