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%I #9 Jan 09 2015 08:01:49
%S 18,63,72,74,83,90,99,107,162,171,227,252,288,296,315,332,347,359,360,
%T 362,387,396,407,428,450,491,495,567,626,648,666,684,711,743,747,794,
%U 810,827,842,855,866,882,887,891,908,954,963,1008,1031,1143,1152,1163
%N Positive integers n such that x^2 - 20xy + y^2 + n = 0 has integer solutions.
%e 63 is in the sequence because x^2 - 20xy + y^2 + 63 = 0 has integer solutions, for example (x, y) = (1, 16).
%Y Cf. A075839 (n = 18), A221763 (n = 63), A198947 (n = 90), A001085 (n = 99).
%Y Cf. A031363, A084917, A237351, A237599, A237606, A237609, A237610, A236330, A236331.
%K nonn
%O 1,1
%A _Colin Barker_, Feb 20 2014
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