A063625 Smallest k such that 8^k has exactly n 9's in its decimal representation.

1, 4, 17, 11, 30, 40, 55, 50, 31, 89, 62, 103, 85, 115, 114, 118, 111, 157, 135, 160, 174, 177, 159, 172, 215, 208, 247, 241, 266, 273, 307, 243, 201, 245, 297, 282, 264, 322, 320, 391, 363, 428, 377, 416, 413, 359, 393, 414, 479, 457, 422

Offset

0,2

Links

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

Mathematica

a = {}; Do[k = 1; While[ Count[ IntegerDigits[8^k], 9] != n, k++ ]; a = Append[a, k], {n, 0, 50} ]; a

Crossrefs

Sequence in context: A195881 A264217 A341442 * A241257 A057596 A070712

Adjacent sequences: A063622 A063623 A063624 * A063626 A063627 A063628

Keyword

base,nonn

Author

Robert G. Wilson v, Aug 10 2001

Extensions

Name corrected by Jon E. Schoenfield, Jun 26 2018

Status

approved