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A106872 Primes of the form 2x^2+xy+4y^2. 6

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

%S 2,5,7,19,41,59,71,97,101,103,107,109,113,157,163,191,193,211,233,257,

%T 281,307,311,317,359,373,397,419,421,439,443,467,479,503,541,547,563,

%U 593,599,659,661,683,691,701,727,733,751,769,877,887,907,977,997,1033

%N Primes of the form 2x^2+xy+4y^2.

%C Discriminant=-31.

%C Primes p such that the polynomial x^3-x^2-1 is irreducible over Zp. The polynomial discriminant is also -31. - _T. D. Noe_, May 13 2005

%H Vincenzo Librandi and Ray Chandler, <a href="/A106872/b106872.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, 4, 10000], QuadPrimes2[2, -1, 4, 10000]] (* see A106856 *)

%Y Primes in A123064.

%K nonn,easy

%O 1,1

%A _T. D. Noe_, May 09 2005

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Last modified April 23 07:16 EDT 2024. Contains 371905 sequences. (Running on oeis4.)