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 A053146 #11 May 30 2018 03:53:01
%S A053146 1,2,4,6,12,11,25,22,32,26,54,55,67,68,85,117,126,113,150,166,130,178,
%T A053146 186,207,201,194,253,255,256,295,284,309,320,315,348,347,365,398,423,
%U A053146 425,433,459,468,488
%N A053146 When cototient function (A051953) is iterated with initial value A002110(n), a(n) = number of iterates that are not powers of 2.
%C A053146 In these iteration chains, the numbers that are not powers of 2 seem to be in the majority.
%e A053146 n=6, A002110(6)=30030; the corresponding iteration chain is: {30030, 24270, 17806, 9238, 4798, 2400, 1760, 1120, 736, 384, 256, 128, 64, 32, 16, 8, 4, 2, 1, 0}. It has 20 terms, among which entries from the first to 10th, also the last 0, are not powers of 2, so a(6)=11.
%Y A053146 Cf. A002110, A051953.
%K A053146 more,nonn
%O A053146 1,2
%A A053146 _Labos Elemer_, Feb 28 2000
%E A053146 a(13)-a(44) from _Donovan Johnson_, May 13 2010