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 A360836 #8 Feb 16 2025 08:34:04 %S A360836 12880,18896570 %N A360836 a(n) is the least n-gonal pyramidal number that is the sum of two or more consecutive nonzero n-gonal pyramidal numbers in more than one way. %C A360836 a(4) > 10^19 if it exists. - _Michael S. Branicky_, Feb 23 2023 %H A360836 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PyramidalNumber.html">Pyramidal Number</a> %e A360836 For n = 2: 12880 = 91 + ... + 903 = 300 + ... + 990. %e A360836 For n = 3: 18896570 = 708561 + ... + 1021384 = 2604125 + ... + 2796160. %Y A360836 Cf. A080851, A360762. %K A360836 nonn,bref,more %O A360836 2,1 %A A360836 _Ilya Gutkovskiy_, Feb 23 2023