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%I #5 Mar 30 2012 18:39:16
%S 1,8,1,8,9,8,1,8,8,1,8,8,1,7,1,8,8,1,8,9,8,1,8,8,1,7,1,8,9,8,1,8,8,1,
%T 7,1,8,8,1,8,8,1,8,9,8,1,8,8,1,7,1,8,9,8,1,8,8,1,8,8,1,7,1,8,8,1,8,9,
%U 8,1,7,1,8,8,1,8,9,8,1,8,8,1,7,1,8,8,1,8,8,1,8,9,8,1,8,8,1,7,1,8,9,8,1,8,8
%N Continued fraction for sum(k>=0,1/9^(2^k-1)).
%C Contains only elements 1<=a(n)<=9 ( but 2,3,4,5 and 6 never occur)
%Y Cf. A004200.
%K cofr,nonn
%O 1,2
%A _Benoit Cloitre_, Apr 10 2003