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Exponent of 4 (value of i) in n-th number of form 4^i*7^j.
2

%I #5 Mar 30 2012 18:35:26

%S 0,1,0,2,1,0,3,2,1,4,0,3,2,5,1,4,0,3,6,2,5,1,4,7,0,3,6,2,5,8,1,4,7,0,

%T 3,6,9,2,5,8,1,4,7,0,10,3,6,9,2,5,8,1,11,4,7,0,10,3,6,9,2,12,5,8,1,11,

%U 4,7,0,10,3,13,6,9,2,12,5,8,1,11,4,14,7,0,10,3,13,6,9,2,12,5,15,8,1,11,4,14,7

%N Exponent of 4 (value of i) in n-th number of form 4^i*7^j.

%K nonn

%O 1,4

%A _David W. Wilson_