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Exponent of 4 (value of i) in n-th number of form 4^i*10^j.
3

%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_