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 A374194 #15 Feb 16 2025 08:34:07 %S A374194 2,5972,5170425 %N A374194 a(n) is the smallest number which can be represented as the sum of two nonzero hexagonal pyramidal numbers in exactly n ways, or -1 if no such number exists. %C A374194 There are no further positive terms <= 10^15. - _Michael S. Branicky_, Jun 30 2024 %H A374194 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/HexagonalPyramidalNumber.html">Hexagonal Pyramidal Number</a> %e A374194 a(2) = 5972 = 1222 + 4750 = 1925 + 4047. %Y A374194 Cf. A002412, A011541, A334013, A374141, A374168, A374193. %K A374194 nonn,hard,more,bref %O A374194 1,1 %A A374194 _Ilya Gutkovskiy_, Jun 30 2024