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A063601 Smallest k such that 6^k has exactly n 5's in its decimal representation. 1
1, 6, 20, 18, 33, 48, 47, 52, 70, 55, 103, 92, 102, 138, 121, 128, 161, 123, 151, 183, 190, 193, 215, 216, 199, 227, 290, 277, 243, 274, 268, 333, 270, 298, 372, 365, 341, 332, 359, 406, 465, 475, 481, 442, 512, 453, 468, 541, 523, 563, 525 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

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

MATHEMATICA

a = {}; Do[k = 1; While[ Count[ IntegerDigits[6^k], 5] != n, k++ ]; a = Append[a, k], {n, 0, 50} ]; a

Join[{1}, With[{c6=DigitCount[#, 10, 5]&/@(6^Range[600])}, Flatten[Table[ Position[ c6, n, 1, 1], {n, 51}]]]] (* Harvey P. Dale, May 17 2018 *)

CROSSREFS

Sequence in context: A321328 A007253 A096897 * A222604 A112809 A289659

Adjacent sequences:  A063598 A063599 A063600 * A063602 A063603 A063604

KEYWORD

base,nonn

AUTHOR

Robert G. Wilson v, Aug 10 2001

EXTENSIONS

Name corrected by Jon E. Schoenfield, Jun 26 2018

STATUS

approved

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Last modified August 3 19:17 EDT 2021. Contains 346441 sequences. (Running on oeis4.)