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A106948 Primes of the form x^2+xy+18y^2, with x and y nonnegative. 2

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

%S 107,293,509,647,739,971,1013,1039,1123,1217,1361,1367,1373,1423,1663,

%T 1811,2083,2099,2239,2309,2351,2657,2677,2917,3181,3343,3517,3533,

%U 3539,3623,3671,3803,4003,4079,4253,4483,4691,4957,5273,5581,5783

%N Primes of the form x^2+xy+18y^2, with x and y nonnegative.

%C Discriminant=-71.

%H Vincenzo Librandi and Ray Chandler, <a href="/A106948/b106948.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[1, 1, 18, 10000] (* see A106856 *)

%K nonn,easy

%O 1,1

%A _T. D. Noe_, May 09 2005

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Last modified April 19 18:05 EDT 2024. Contains 371798 sequences. (Running on oeis4.)