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 A225176 #5 May 01 2013 14:18:33 %S A225176 1,1,1,2,3,2,2,4,7,6,13,12,16,24,31,51,66,87,126,139,187,260,331,412, %T A225176 551,693 %N A225176 Number of numbers which require n iterations of the bi-unitary totient function (A116550) to reach 1. %D A225176 M. Lal, H. Wareham and R. Mifflin, Iterates of the bi-unitary totient function, Utilitas Math., 10 (1976), 347-350. %Y A225176 Cf. A116550, A005424, A225175, A225174, A047994, A003271, A225172, A225173. %K A225176 nonn,more %O A225176 1,4 %A A225176 _N. J. A. Sloane_, May 01 2013