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 A374287 #7 Jul 07 2024 21:06:34 %S A374287 -1,65,62,90,103,136,200,276,376,481,625,806,975,1183,1415,1688,1989, %T A374287 2325,2698,3110,3563,4059,4600,5188,5825,6513,7254,8050,8903,9815, %U A374287 10788,11824,12925,14093,15330,16638,18019,19475,21008,22620,24313,26089,27950,29898 %N A374287 a(n) is the smallest number which can be represented as the sum of n distinct nonzero squares in exactly 2 ways, or -1 if no such number exists. %H A374287 <a href="/index/Su#ssq">Index entries for sequences related to sums of squares</a> %e A374287 a(2) = 65 = 1^2 + 8^2 = 4^2 + 7^2. %e A374287 a(3) = 62 = 1^2 + 5^2 + 6^2 = 2^2 + 3^2 + 7^2. %Y A374287 Cf. A000330, A093195, A350241. %K A374287 sign %O A374287 1,2 %A A374287 _Ilya Gutkovskiy_, Jul 02 2024 %E A374287 a(12) and beyond from _Michael S. Branicky_, Jul 02 2024