Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #10 Jun 03 2022 14:55:44
%S 0,2,3,5,8,12,13,18,20,27,30,32,37,43,45,48,50,52,53,62,67,72,75,78,
%T 80,82,83,93,98,107,108,117,120,123,125,128,130,142,147,148,155,157,
%U 158,162,163,172,173,178,180,192,195,197,200,205,208,212,213,222,227,237,242,243,245,248,258,267,268,270,277,283
%N Nonnegative integers of the form 2x^2 + 4xy - 3y^2.
%C Discriminant 40.
%C From _Jon E. Schoenfield_, Jun 03 2022: (Start)
%C Also nonnegative integers of the form 5x^2 - 2y^2.
%C Also nonnegative integers of the form 2x^2 - 5y^2. (End)
%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)
%Y Primes in this sequence = A141179.
%K nonn
%O 1,2
%A _N. J. A. Sloane_, May 31 2014