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Exponent of 10 (value of j) in n-th number of form 3^i*10^j.
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%I #13 Feb 26 2024 15:24:31

%S 0,0,0,1,0,1,0,1,2,0,1,2,0,1,2,3,0,1,2,3,0,1,2,3,4,0,1,2,3,4,0,1,2,3,

%T 4,5,0,1,2,3,4,5,0,1,2,3,4,5,6,0,1,2,3,4,5,6,0,1,2,3,4,5,6,7,0,1,2,3,

%U 4,5,6,7,0,1,2,3,4,5,6,7,8,0,1,2,3,4,5,6,7,8,0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7

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

%C Different from A055087, since a(143)=0 and a(144)=11.

%F a(n) = A007814(A025616(n)). - _R. J. Mathar_, Feb 26 2024

%Y Cf. A007814, A025616, A055087.

%K nonn

%O 1,9

%A _David W. Wilson_