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 A380304 #11 Jan 22 2025 06:04:20 %S A380304 1,12,18,12,24,24,31,18,42,32,24,60,31,42,56,72,32,48,54,48,60,56,90, %T A380304 42,96,84,72,48,72,98,54,120,72,120,80,90,60,168,96,104,84,144,96,144, %U A380304 72,114,140,96,168,80,84,224,108,132,120,180,90,234,168,128,144,120,252,98,156,216,104,192,108,280,216,152,248,114,240,144,182,180,144,360,168,224,156,312,128,252,132,336,240,270,288,140,336,192 %N A380304 a(n) = sigma(A380303(n)). %F A380304 a(n) = sigma(A380303(n)) = A000203(A380303(n)). %Y A380304 Except for a(1)=1, subsequence of A206421. %Y A380304 Cf. A000203, A206036, A211656, A241480, A241481, A241625, A380303. %K A380304 nonn %O A380304 1,2 %A A380304 _Max Alekseyev_, Jan 19 2025