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A106921 Primes of the form x^2+xy+15y^2, with x and y nonnegative. 1

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

%S 17,71,139,163,197,223,317,373,383,389,439,461,479,521,547,631,641,

%T 677,727,733,743,787,827,1019,1063,1103,1181,1229,1237,1327,1361,1373,

%U 1511,1559,1619,1657,1693,1747,1823,1907,1913,1951,2113,2129,2131

%N Primes of the form x^2+xy+15y^2, with x and y nonnegative.

%C Discriminant=-59.

%H Vincenzo Librandi and Ray Chandler, <a href="/A106921/b106921.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, 15, 10000] (* see A106856 *)

%K nonn,easy

%O 1,1

%A _T. D. Noe_, May 09 2005

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Last modified April 19 19:02 EDT 2024. Contains 371798 sequences. (Running on oeis4.)