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 A366552 #14 Oct 18 2023 10:03:33 %S A366552 0,1,104,122,0,130,3,9,103,0,119,5,11,105,0,121,7,13,107,0,123,9,15, %T A366552 109,0,125,11,17,111,0 %N A366552 a(n) is the index of the first row of A296142 in which n appears, or 0 if n does not appear. %C A366552 a(5k) = 0 for all k, since no multiple of 5 appears in A296142. %Y A366552 Cf. A296142, A321351. %K A366552 nonn,more %O A366552 1,3 %A A366552 _Jeremy F. Alm_, Oct 13 2023