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 A364731 #6 Sep 06 2023 08:09:30 %S A364731 0,1,3,5,6,8,10,14,13,17,20,19,25,24,29,-1,31,36,38,40,39,44,46,-1,51, %T A364731 52,61,57,62,60,67,71,70,72,76,77,79,92,94,86,90,91,95,99,105,-1,108, %U A364731 104,118,116,114,124,122,-1,123,130,135,134,141,138,140,160,148 %N A364731 a(n) is the index of the first occurrence of n in A364443, or -1 if n doesn't occur. %C A364731 Compared to A364443, this sequence is what A363763 is to A077773. %H A364731 Hugo Pfoertner, <a href="/A364731/b364731.txt">Table of n, a(n) for n = 0..10000</a> %Y A364731 Cf. A077773, A363763, A364729, A364730, A364732. %K A364731 sign %O A364731 0,3 %A A364731 _Hugo Pfoertner_, Aug 06 2023