%I #5 Mar 30 2012 18:35:26
%S 0,1,0,2,1,0,3,2,1,0,4,3,2,1,0,5,4,3,2,1,0,6,5,4,3,2,1,7,0,6,5,4,3,2,
%T 8,1,7,0,6,5,4,3,9,2,8,1,7,0,6,5,4,10,3,9,2,8,1,7,0,6,5,11,4,10,3,9,2,
%U 8,1,7,0,6,12,5,11,4,10,3,9,2,8,1,7,13,0,6,12,5,11,4,10,3,9,2,8,14,1,7,13,0,6
%N Exponent of 7 (value of i) in n-th number of form 7^i*10^j.
%K nonn
%O 1,4
%A _David W. Wilson_