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 A053474 #15 Mar 14 2018 06:47:48 %S A053474 6,14,18,30,28,30,44,60,60,62,82,68,74,94,106,88,126,102,104,110,150, %T A053474 120,124,164,158,136,138,178,148,150,190,164,212,176,174,182,246,252, %U A053474 194,198,204,208,220,234,286,318,242,322,302,328 %N A053474 Cototients of non-cototient numbers: A051953(A005278(n)). %C A053474 The iteration-graph (rooted tree) of A051953 has initial vertices given by A005278. Sequence gives immediate successors of initial terms. The iteration ends at 0 fixed point. %H A053474 Michel Marcus, <a href="/A053474/b053474.txt">Table of n, a(n) for n = 1..10000</a> %e A053474 30, 60, 150 and 164 occur twice in the terms shown. These numbers occur in A051953, but their arguments do not: 50, 58 or 100, 116 or 222, 298 or 260, 326 are non-cototients, terms of A005278. %Y A053474 Cf. A005278, A051953. %K A053474 nonn %O A053474 1,1 %A A053474 _Labos Elemer_, Jan 14 2000