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 A200730 #14 Jul 16 2017 20:19:40 %S A200730 1,5041,1601613,1221611509,355183455415293 %N A200730 Smallest nontrivial positive power x such that the number of odd powers (i.e., odd base) not exceeding x exceeds by n the number of even powers not exceeding x. %e A200730 a(3)=1601613 because there are 699 odd powers not larger than 1601613, and 696 even powers not larger than 1601613, and 699 - 696 = 3. %Y A200730 Cf. A200729. %K A200730 nonn %O A200730 1,2 %A A200730 _Graeme McRae_, Nov 21 2011