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 A216161 #10 Jan 04 2013 23:01:57 %S A216161 3,2,2,4,3,5,7,3,1,7,0,4,4,1,2,6,3,4,1,7,7,1,0,9,6,8,4,3,6,1,8,3,1,4, %T A216161 6,5,9,1,9,8,2,2,1,4,3,5,5,5,3,3,9,9,0,9,1,4,8,1,5,8,2,6,9,6,7,6,6,3, %U A216161 6,9,9,2,9,2,4,2,4,9,3,3,1,2,8,4,9,6,7,5,5,1,5,8,9,6,7,1,1,2,6,6,0,9,4,4,2,9 %N A216161 [11^(5*10^n) mod 10^(2n+2) - 1]/(10^(2n+1)) mod 10. %C A216161 11^50 ends in 23001 %C A216161 11^500 ends in 2230001 %C A216161 11^5000 ends in 422300001 %C A216161 11^50000 ends in 34223000001 %C A216161 The last digits before the zeros converge to this sequence. %Y A216161 Cf. A007185, A016090, A091663, A018248, A091664, A018247. %Y A216161 A216159 gives 10's-complement. %K A216161 nonn,base %O A216161 1,1 %A A216161 _V. Raman_, Sep 02 2012