%N Nonnegative integers of the form -x^2+6xy+3y^2.
%C Discriminant 48.
%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 = A141187.
%A _N. J. A. Sloane_, Jun 01 2014