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 A216159 #5 Sep 02 2012 18:00:08
%S A216159 7,7,7,5,6,4,2,6,8,2,9,5,5,8,7,3,6,5,8,2,2,8,9,0,3,1,5,6,3,8,1,6,8,5,
%T A216159 3,4,0,8,0,1,7,7,8,5,6,4,4,4,6,6,0,0,9,0,8,5,1,8,4,1,7,3,0,3,2,3,3,6,
%U A216159 3,0,0,7,0,7,5,7,5,0,6,6,8,7,1,5,0,3,2,4,4,8,4,1,0,3,2,8,8,7,3,3,9,0,5,5,7,0
%N A216159 10's-complement of A216161.
%C A216159 11^50 ends in 23001
%C A216159 11^500 ends in 2230001
%C A216159 11^5000 ends in 422300001
%C A216159 11^50000 ends in 34223000001
%C A216159 The last digits before the zeros tend to converge.
%F A216159 a(n) = 10 - [{11^(5*10^n) mod 10^(2n+2) - 1}/(10^(2n+1)) mod 10].
%Y A216159 Cf. A216161, A007185, A016090, A091663, A018248, A091664, A018247.
%K A216159 nonn
%O A216159 1,1
%A A216159 _V. Raman_, Sep 02 2012