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 A176921 #4 Mar 31 2012 12:38:36
%S A176921 1,1,3,1,1,3,294,1,81,1,242,3,1014,294,3,1,4624,81,6498,1,294,242,
%T A176921 11638,3,1,1014,2187,294,23548,3,14415,1,726,4624,294,81,4107,6498,
%U A176921 1014,1,8405,294,38829,242,81,11638,101614,3,100842,1,13872,1014,36517,2187
%N A176921 Period of decimal representation of 1/n^3.
%t A176921 DigitCycleLength[r_Rational,b_Integer?Positive]:=MultiplicativeOrder[b,FixedPoint[Quotient[ #,GCD[ #,b]]&,Denominator[r]]];Table[If[n<2,1,DigitCycleLength[1/n^3,10]],{n,5!}]
%Y A176921 Cf. A007732, A176920
%K A176921 nonn,base
%O A176921 1,3
%A A176921 _Vladimir Joseph Stephan Orlovsky_, Apr 29 2010