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A063568
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5^a(n) is the smallest positive power of 5 having n in its decimal representation.
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2
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8, 3, 2, 5, 11, 1, 4, 7, 7, 8, 14, 23, 3, 30, 12, 6, 20, 15, 22, 9, 13, 33, 13, 22, 12, 2, 18, 37, 11, 17, 15, 5, 19, 35, 19, 14, 20, 21, 18, 8, 12, 12, 37, 20, 12, 17, 18, 21, 11, 26, 23, 14, 16, 9, 30, 23, 6, 15, 16, 24, 24
(list;
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refs;
listen;
history;
text;
internal format)
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OFFSET
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0,1
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LINKS
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Harvey P. Dale, Table of n, a(n) for n = 0..1000
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MATHEMATICA
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a = {}; Do[k = 1; While[ StringPosition[ ToString[5^k], ToString[n]] == {}, k++ ]; a = Append[a, k], {n, 0, 60} ]; a
sp5[n_]:=Module[{k=1, idn=IntegerDigits[n]}, While[SequenceCount[ IntegerDigits[ 5^k], idn] == 0, k++]; k]; Array[sp5, 70, 0] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Aug 05 2019 *)
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CROSSREFS
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Essentially the same as A062522.
Sequence in context: A119277 A273556 A154014 * A302138 A198494 A100668
Adjacent sequences: A063565 A063566 A063567 * A063569 A063570 A063571
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KEYWORD
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base,nonn
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AUTHOR
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Robert G. Wilson v, Aug 10 2001
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STATUS
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approved
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