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A106927 Primes of the form 2x^2+xy+8y^2, with x and y any integer. 1

%I #20 Aug 05 2014 14:16:29

%S 2,11,23,29,53,71,107,113,137,149,179,191,197,233,239,263,281,317,347,

%T 359,389,401,431,443,449,491,557,569,599,617,641,653,659,683,701,743,

%U 809,821,827,863,911,947,953,977,1019,1031,1061,1103,1163,1187,1229

%N Primes of the form 2x^2+xy+8y^2, with x and y any integer.

%C Discriminant=-63.

%H Vincenzo Librandi and Ray Chandler, <a href="/A106927/b106927.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 Union[QuadPrimes2[2, 1, 8, 10000], QuadPrimes2[2, -1, 8, 10000]] (* see A106856 *)

%K nonn,easy

%O 1,1

%A _T. D. Noe_, May 09 2005

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Last modified April 23 09:45 EDT 2024. Contains 371905 sequences. (Running on oeis4.)