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 A334011 #11 Feb 16 2025 08:34:00 %S A334011 1,872,8240232,263346158075 %N A334011 a(n) is the least integer that can be expressed as the sum of one or more consecutive nonzero heptagonal numbers in exactly n ways. %H A334011 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/HeptagonalNumber.html">Heptagonal Number</a> %H A334011 <a href="/index/Pol#polygonal_numbers">Index to sequences related to polygonal numbers</a> %e A334011 Let S(k, m) denote the sum of m heptagonal numbers starting from the k-th. We have %e A334011 a(1) = S(1, 1); %e A334011 a(2) = S(13, 2) = S(3, 8); %e A334011 a(3) = S(133, 98) = S(479, 14) = S(168, 77); %e A334011 a(4) = S(6773, 1785) = S(810, 6006) = S(7467, 1547) = S(38758, 70). %Y A334011 Cf. A000566, A054859, A068314, A186337, A298467, A322636, A334007, A334008, A334010, A334012. %K A334011 nonn,hard,more %O A334011 1,2 %A A334011 _Ilya Gutkovskiy_, Apr 12 2020 %E A334011 a(4) from _Giovanni Resta_, Apr 14 2020