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 A157680 #3 Mar 30 2012 18:52:03 %S A157680 9,8,8,7,1,5,6,6,5,5,4,8,2,3,7,7,6,6,5,9,3,4,4,3,3,2,6,0,1,5,9,3,4,8, %T A157680 2,6,7,8,9,9,8,8,7,1,5,6,6,5,5,4,8,2,3,7,7,6,6,5,9,3,4,4,3,3,2,6,0,1, %U A157680 5,9,3,4,8,2,6,7,8,9,0,9,9,8,2,6,7,7,6,6,5,9,3,4,8,8,7,7,6,0,4,5,5,4,4,3,7,1,2 %N A157680 Least significant decimal digit of A157644(n). %C A157680 a(n+39)=a(n), n=1..39, a transient phenomenon, see A157645. %K A157680 nonn,base,less %O A157680 1,1 %A A157680 _Paul Curtz_, Mar 04 2009 %E A157680 Edited by _R. J. Mathar_, Mar 15 2009