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A063594 Smallest k such that 5^k has exactly n 9's in its decimal representation. 1
1, 8, 17, 23, 58, 59, 40, 57, 74, 92, 93, 114, 112, 143, 155, 156, 160, 193, 113, 195, 212, 214, 215, 236, 216, 287, 291, 295, 309, 289, 288, 360, 274, 371, 427, 418, 444, 462, 478, 464, 466, 494, 530, 545, 482, 561, 481, 597, 644, 689, 650 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Harry J. Smith, Table of n, a(n) for n = 0..150

MATHEMATICA

a = {}; Do[k = 1; While[ Count[ IntegerDigits[5^k], 9] != n, k++ ]; a = Append[a, k], {n, 0, 50} ]; a

PROG

(PARI) a(n)={my(k=1); while(n<>#select(d->d==9, digits(5^k)), k++); k} \\ Harry J. Smith, Aug 26 2009, Andrew Howroyd, Jun 26 2018

CROSSREFS

Sequence in context: A088488 A031458 A044991 * A110474 A118066 A044060

Adjacent sequences:  A063591 A063592 A063593 * A063595 A063596 A063597

KEYWORD

base,nonn

AUTHOR

Robert G. Wilson v, Aug 10 2001

EXTENSIONS

Name corrected by Jon E. Schoenfield, Jun 25 2018

STATUS

approved

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Last modified October 23 03:37 EDT 2018. Contains 316519 sequences. (Running on oeis4.)