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 A133702 #7 Mar 23 2022 00:55:48 %S A133702 1,2,4,3,4,8,4,4,9,8,4,12,4,8,16,5,6,18,4,12,16,8,4,16,9,8,16,12,4,32, %T A133702 8,6,16,12,16,27,4,8,16,16,6,32,8,12,36,8,4,20,9,18,24,12,4,32,16,16, %U A133702 16,8,4,48,4,16,44,7,20,32,4,18,16,32,4,36,10,8,36,12,16,32,4,20,25,12,4,48 %N A133702 A051731 * A023136. %C A133702 A023136 = (1, 1, 3, 1, 3, 3, 3, 1, 5, 3, ...). %F A133702 Inverse Mobius transform of A023136. %e A133702 a(4) = 3 = (1, 1, 0, 1) * (1, 1, 3, 1) = (1, 1, 0, 1), row 4 of triangle A133701. %Y A133702 Cf. A051731, A133698, A023136. %K A133702 nonn %O A133702 1,2 %A A133702 _Gary W. Adamson_, Sep 21 2007 %E A133702 More terms from _R. J. Mathar_, Jan 19 2009