A063628 Smallest k such that 9^k has exactly n 2's in its decimal representation.

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

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: A232076 A329770 A099476 * A280201 A378847 A296842

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