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 A374269 #7 Jul 09 2024 16:40:46 %S A374269 -1,1105,13896,300834,1386406515,2063792939 %N A374269 a(n) is the smallest number which can be represented as the sum of n distinct positive n-th powers in exactly 4 ways, or -1 if no such number exists. %e A374269 a(2) = 1105 = 4^2 + 33^2 = 9^2 + 32^2 = 12^2 + 31^2 = 23^2 + 24^2. %e A374269 a(3) = 13896 = 1^3 + 12^3 + 23^3 = 2^3 + 4^3 + 24^3 = 4^3 + 18^3 + 20^3 = 9^3 + 10^3 + 23^3. %Y A374269 Cf. A025305, A146756, A374228, A374256, A374257. %K A374269 sign,more %O A374269 1,2 %A A374269 _Ilya Gutkovskiy_, Jul 02 2024 %E A374269 a(6) from _Michael S. Branicky_, Jul 09 2024