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%I #9 Jan 09 2015 08:01:43
%S 20,39,56,71,80,84,95,104,111,116,119,120,156,180,191,224,239,255,284,
%T 296,311,320,336,351,359,380,399,404,416,431,444,455,464,471,476,479,
%U 480,500,504,551,596,599,624,639,680,695,696,719,720,756,764,791,824
%N Positive integers n such that x^2 - 22xy + y^2 + n = 0 has integer solutions.
%e 39 is in the sequence because x^2 - 22xy + y^2 + 39 = 0 has integer solutions, for example (x, y) = (2, 43).
%Y Cf. A157014 (n = 20), A137881 (n = 104), A077422 (n = 120), A133275 (n = 180).
%Y Cf. A031363, A084917, A237351, A237599, A237606, A237609, A237610, A236330, A236331, A238240.
%K nonn
%O 1,1
%A _Colin Barker_, Feb 20 2014
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