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A180953
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The number of terms of the form 2^i*5^j (A003592) less than or equal to 10^n.
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2
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1, 6, 15, 29, 48, 72, 100, 134, 172, 214, 262, 314, 371, 433, 500, 571, 647, 728, 813, 904, 999, 1099, 1204, 1313, 1427, 1546, 1670, 1798, 1932, 2070, 2212, 2359, 2511, 2668, 2829, 2996, 3167, 3342, 3523, 3708, 3898, 4093, 4293, 4497, 4706, 4920, 5138
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OFFSET
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0,2
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LINKS
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MATHEMATICA
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f[n_] := Sum[1 + Floor@ Log[2, 10^n/5^k], {k, 0, Floor@ Log[5, 10^n]}]; Array[f, 47, 0]
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CROSSREFS
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KEYWORD
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base,nonn
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AUTHOR
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STATUS
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approved
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