%I #8 Aug 09 2012 13:47:53
%S 0,1,0,2,1,3,0,2,4,1,3,0,5,2,4,1,6,3,0,5,2,7,4,1,6,3,8,0,5,2,7,4,9,1,
%T 6,3,8,0,5,10,2,7,4,9,1,6,11,3,8,0,5,10,2,7,12,4,9,1,6,11,3,8,13,0,5,
%U 10,2,7,12,4,9,14,1,6,11,3,8,13,0,5,10,15,2,7,12,4,9,14,1,6,11,16,3,8,13,0,5,10
%N Exponent of 4 (value of i) in n-th number of form 4^i*10^j.
%Y Differs from A025641 at a(114). A025686 is exponent of 10.
%K nonn
%O 1,4
%A _David W. Wilson_