This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A054737 #9 Feb 20 2022 21:45:08 %S A054737 253,1265,2225,2530,6325,12650,18025,18975,22250,24982,25300,31625, %T A054737 63250,94875,126500,158125,180250,189750,221375,222500,249820,253000, %U A054737 316250,632500,702247,948750,1265000,1581250,1802500,1897500,2213750,2225000,2498200,2530000 %N A054737 Numbers n such that n^2 can be split into two nonzero squares (perhaps with leading zeros) in exactly two different ways. %e A054737 2225^2=4950625 can be split into 49=7^2 and 50625=225^2 or into 4=2^2 and 950625=975^2; 2530^2=6400900 can be split into 6400=80^2 and 900=30^2 or into 64=8^2 and 00900=30^2 %Y A054737 Cf. A048375, A054738. %K A054737 base,nonn %O A054737 1,1 %A A054737 _Henry Bottomley_, Apr 26 2000 %E A054737 More terms from _Sean A. Irvine_, Feb 20 2022