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A063568 5^a(n) is the smallest positive power of 5 having n in its decimal representation. 2
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; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Harvey P. Dale, Table of n, a(n) for n = 0..1000

MATHEMATICA

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 *)

CROSSREFS

Essentially the same as A062522.

Sequence in context: A119277 A273556 A154014 * A302138 A198494 A100668

Adjacent sequences:  A063565 A063566 A063567 * A063569 A063570 A063571

KEYWORD

base,nonn

AUTHOR

Robert G. Wilson v, Aug 10 2001

STATUS

approved

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Last modified October 22 22:34 EDT 2019. Contains 328335 sequences. (Running on oeis4.)