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A063628 Smallest k such that 9^k has exactly n 2's in its decimal representation. 2
1, 3, 15, 12, 28, 26, 30, 39, 70, 50, 54, 82, 93, 106, 105, 80, 110, 121, 130, 135, 156, 175, 173, 183, 174, 211, 194, 264, 158, 216, 285, 251, 306, 262, 308, 298, 263, 322, 346, 323, 354, 276, 375, 380, 419, 350, 404, 432, 384, 465, 403 (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[9^k], 2] != n, k++ ]; a = Append[a, k], {n, 0, 50} ]; a

CROSSREFS

Sequence in context: A297897 A232076 A099476 * A280201 A296842 A279925

Adjacent sequences:  A063625 A063626 A063627 * A063629 A063630 A063631

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 October 19 10:58 EDT 2019. Contains 328216 sequences. (Running on oeis4.)