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%I #9 Jul 02 2016 00:52:40
%S 9,19,33,35,73,99,145,161,163,195,243,393,483,513,577,721,723,1153,
%T 1763,2177,2305,2593,4803,5185,5833,6273,6963,7057,7395,8713,9523,
%U 9603,10083,12483,13923,14113,15875,17425,17673,19043,19601,20737,26243
%N Numbers n such that n^2 - 1 is the average of two nonzero squares in exactly one way.
%C In other words, numbers n such that n^2 - 1 is the sum of two nonzero distinct squares in exactly one way. This explains why there are many common terms between this sequence and A050797.
%e 9 is a term because 9^2 - 1 = (4^2 + 12^2) / 2.
%Y Cf. A050797.
%K nonn
%O 1,1
%A _Altug Alkan_, Jun 29 2016
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