login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A063579 Smallest k such that 4^k has exactly n 4's in its decimal representation. 1
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 (list; graph; refs; listen; history; text; internal format)
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: A305178 A295851 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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 3 05:29 EDT 2020. Contains 334798 sequences. (Running on oeis4.)