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 A374273 #14 Feb 16 2025 08:34:07 %S A374273 37,161,498,1666,2546,7434,16609,25952,48786,49861,72347,127335, %T A374273 183289,196469,416913,466546,494369,506649,801010,1401011,2372586, %U A374273 1414009,2003027,3274986,2927260,2721677,5592756,8016592,6632759,7057914,8401837,13248146,11648679,8650006 %N A374273 a(n) is the smallest number which can be represented as the sum of three distinct nonzero n-gonal numbers in exactly n ways, or -1 if no such number exists. %H A374273 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PolygonalNumber.html">Polygonal Number</a> %e A374273 a(3) = 37 = 1 + 15 + 21 = 3 + 6 + 28 = 6 + 10 + 21. %e A374273 a(4) = 161 = 1^2 + 4^2 + 12^2 = 2^2 + 6^2 + 11^2 = 4^2 + 8^2 + 9^2 = 5^2 + 6^2 + 10^2. %Y A374273 Cf. A025415, A057145, A350405, A374144, A374274. %K A374273 nonn %O A374273 3,1 %A A374273 _Ilya Gutkovskiy_, Jul 02 2024 %E A374273 a(21) and beyond from _Michael S. Branicky_, Jul 08 2024