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A063562 Smallest k such that 3^k has exactly n 7's in its decimal representation. 0
1, 3, 23, 11, 47, 41, 50, 100, 123, 90, 174, 112, 179, 172, 201, 233, 168, 146, 211, 280, 247, 330, 294, 369, 411, 390, 401, 451, 374, 344, 448, 468, 516, 501, 536, 559, 574, 498, 523, 577, 662, 678, 722, 618, 615, 833, 686, 782, 717, 794, 707 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..50.

MATHEMATICA

a = {}; Do[k = 1; While[ Count[ IntegerDigits[3^k], 7] != n, k++ ]; a = Append[a, k], {n, 0, 50} ]; a

CROSSREFS

Sequence in context: A285098 A088605 A272816 * A130475 A212998 A157819

Adjacent sequences:  A063559 A063560 A063561 * A063563 A063564 A063565

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 May 11 18:21 EDT 2021. Contains 343808 sequences. (Running on oeis4.)