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 A023155 #12 Mar 30 2012 18:35:18 %S A023155 1,2,2,2,2,4,4,2,4,4,4,4,4,8,4,2,2,8,6,4,8,8,4,4,4,8,6,8,4,8,10,2,8,4, %T A023155 8,8,6,12,8,4,4,16,10,8,8,8,4,4,10,8,4,8,4,12,8,8,12,8,4,8,10,20,16,2, %U A023155 8,16,10,4,8,16,10,8,6,12,8,12,16,16,10,4,8,8,6,16,4,20,8,8,4,16,16,8,20,8,12 %N A023155 Number of cycles of function f(x) = x^4 mod n. %C A023155 Not multiplicative; the smallest counterexample is a(275). - _T. D. Noe_, Nov 14 2006 %H A023155 David W. Wilson, <a href="/A023155/b023155.txt">Table of n, a(n) for n=1..10000</a> %Y A023155 Cf. A023153 %Y A023155 Cf. A023153-A023161 (cycles of the functions f(x)=x^k mod n for k=2..10) %K A023155 nonn %O A023155 1,2 %A A023155 _David W. Wilson_