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 A294406 #32 Sep 08 2021 21:17:26 %S A294406 9,13,15,21,23,27,29,33,35,43,45 %N A294406 Positive odd numbers k such that both (sigma(m) - 2*m) and (2*m - sigma(m)) are never equal to k, where sigma(.) is the sum of divisors function A000203 (conjectured). %Y A294406 Intersection of A234285 and A234286. %Y A294406 Inspired by _Michel Marcus_'s comment in A294347. %Y A294406 Cf. A000203, A033879, A033880, A005100, A005101. %K A294406 nonn,more,hard %O A294406 1,1 %A A294406 _Omar E. Pol_, Oct 30 2017