%I #2 Mar 30 2012 18:50:58
%S 4,23,281,2825,28287,282890,2828964,28289682,282896825
%N Number of terms of A061681 having length = n in decimal representation.
%C A055642(a(n)) = n; a(n) / A130901(n) --> 1.
%e a(1)=#{1,2,4,8}=4;
%e a(2)=#{16,17,18,19,20,22,24,26,28,30,33,36,39,42,46,50,55,60,66,72,79,86,94}=23.
%K nonn,base,more
%O 1,1
%A _Reinhard Zumkeller_, Jun 08 2007
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