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A106871 Primes of the form 2x^2+xy+4y^2, with x and y nonnegative. 2


%S 2,7,41,59,101,107,109,233,257,281,307,311,397,419,421,503,599,659,

%T 691,733,751,907,1051,1061,1087,1103,1163,1217,1249,1279,1291,1307,

%U 1321,1361,1373,1433,1471,1489,1597,1621,1693,1733,1777,1787,1831

%N Primes of the form 2x^2+xy+4y^2, with x and y nonnegative.

%C Discriminant=-31.

%H Vincenzo Librandi and Ray Chandler, <a href="/A106871/b106871.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, 4, 10000] (* see A106856 *)

%Y Cf. A123064, A106872.

%K nonn,easy

%O 1,1

%A _T. D. Noe_, May 09 2005

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Last modified September 26 06:16 EDT 2021. Contains 347664 sequences. (Running on oeis4.)