%I #8 Oct 09 2013 11:28:16
%S 3,7,12,13,19,21,27,28,31,39,43,48,52,57,61,63,67,73,75,76,84,91,93,
%T 97,103,108,109,111,112,117,124,127,129,133,139,147,151,156,157,163,
%U 171,172,175
%N Values of d such that the equation x^2 - d*y^2 = 3*d has integer solutions.
%e 43 appears in the sequence because the equation x^2 - 43*y^2 = 129 has integer solutions, such as (x,y) = (86,13).
%Y Cf. A172000, A230108.
%K nonn
%O 1,1
%A _Colin Barker_, Oct 09 2013