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%I #6 Feb 08 2020 04:07:10
%S 1,6,15,29,48,72,100,134,172,214,262,314,371,433,500,571,647,728,813,
%T 904,999,1099,1204,1313,1427,1546,1670,1798,1932,2070,2212,2359,2511,
%U 2668,2829,2996,3167,3342,3523,3708,3898,4093,4293,4497,4706,4920,5138
%N The number of terms of the form 2^i*5^j (A003592) less than or equal to 10^n.
%H Amiram Eldar, <a href="/A180953/b180953.txt">Table of n, a(n) for n = 0..10000</a>
%t f[n_] := Sum[1 + Floor@ Log[2, 10^n/5^k], {k, 0, Floor@ Log[5, 10^n]}]; Array[f, 47, 0]
%Y Cf. A003592.
%K base,nonn
%O 0,2
%A _Robert G. Wilson v_, Sep 27 2010