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A063589 Smallest k such that 5^k has exactly n 4's in its decimal representation. 0
1, 11, 20, 12, 33, 41, 58, 87, 45, 76, 91, 106, 114, 136, 156, 150, 115, 140, 198, 190, 218, 189, 241, 231, 283, 254, 243, 311, 249, 275, 347, 345, 353, 294, 460, 361, 372, 496, 420, 431, 499, 424, 484, 546, 428, 449, 483, 558, 613, 540, 622 (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[5^k], 4] != n, k++ ]; a = Append[a, k], {n, 0, 50} ]; a

CROSSREFS

Sequence in context: A003284 A257401 A283903 * A102815 A105957 A105958

Adjacent sequences:  A063586 A063587 A063588 * A063590 A063591 A063592

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 March 28 11:49 EDT 2020. Contains 333083 sequences. (Running on oeis4.)