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A106947 Primes of the form 2x^2-xy+9y^2, with x and y nonnegative. 1

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

%S 2,37,83,101,199,223,251,313,431,547,571,719,821,839,983,1097,1129,

%T 1327,1447,1499,1549,1669,1847,1997,2003,2113,2203,2207,2287,2297,

%U 2593,2663,3061,3169,3259,3361,3391,3457,3511,3559,3593,3821,3877

%N Primes of the form 2x^2-xy+9y^2, with x and y nonnegative.

%C Discriminant=-71.

%H Vincenzo Librandi and Ray Chandler, <a href="/A106947/b106947.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, 9, 10000] (* see A106856 *)

%K nonn,easy

%O 1,1

%A _T. D. Noe_, May 09 2005

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Last modified August 3 21:27 EDT 2024. Contains 374905 sequences. (Running on oeis4.)