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 A374424 #7 Jul 19 2024 19:14:34 %S A374424 12,90,1036,6834,4062500,160426515,2056364173794800 %N A374424 a(n) is the smallest number which can be represented as the sum of 4 distinct positive n-th powers in exactly 2 ways, or -1 if no such number exists. %e A374424 a(5) = 4062500 = 1^5 + 14^5 + 16^5 + 19^5 = 5^5 + 10^5 + 15^5 + 20^5. %e A374424 a(6) = 160426515 = 1^6 + 3^6 + 19^6 + 22^6 = 1^6 + 10^6 + 15^6 + 23^6. %Y A374424 Cf. A046881, A374418, A374421, A374422, A374423, A374425. %K A374424 nonn,hard,more %O A374424 1,1 %A A374424 _Ilya Gutkovskiy_, Jul 08 2024 %E A374424 a(7) from _Michael S. Branicky_, Jul 09 2024