A063579 - OEIS

A063579

Smallest k such that 4^k has exactly n 4's in its decimal representation.

2, 1, 9, 11, 32, 53, 64, 75, 82, 69, 91, 134, 144, 161, 189, 133, 132, 198, 192, 253, 225, 219, 268, 236, 284, 252, 255, 374, 296, 315, 355, 372, 404, 421, 414, 450, 361, 538, 501, 471, 459, 482, 533, 544, 445, 666, 640, 586, 615, 565, 665

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OFFSET

0,1

LINKS

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

MATHEMATICA

a = {}; Do[k = 1; While[ Count[ IntegerDigits[4^k], 4] != n, k++ ]; a = Append[a, k], {n, 0, 50} ]; a

CROSSREFS

Sequence in context: A295851 A368375 A192324 * A240085 A078623 A198204

Adjacent sequences: A063576 A063577 A063578 * A063580 A063581 A063582

KEYWORD

base,nonn

AUTHOR

Robert G. Wilson v, Aug 10 2001

EXTENSIONS

Name corrected by Jon E. Schoenfield, Jun 26 2018

STATUS

approved