login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A216659 Number of n-digit 9th powers. 2
2, 0, 1, 0, 1, 1, 1, 2, 2, 3, 4, 5, 6, 8, 11, 13, 18, 22, 30, 37, 49, 63, 81, 105, 135, 175, 225, 292, 377, 486, 628, 811, 1048, 1353, 1748, 2257, 2916, 3766, 4863, 6281, 8113, 10477, 13533, 17478, 22573, 29155, 37656, 48633, 62812, 81126, 104777, 135326 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Alois P. Heinz, Table of n, a(n) for n = 1..1000

EXAMPLE

a(1) = 2: 0, 1.

a(3) = 1: 512.

a(5) = 1: 19683.

a(9) = 2: 134217728, 387420489.

a(10) = 3: 1000000000, 2357947691, 5159780352.

a(11) = 4: 10604499373, 20661046784, 38443359375, 68719476736.

MAPLE

r:= proc(n, k) local b; b:= iroot(n, k); b+`if`(b^k<n, 1, 0) end:

a:= n-> r(10^n, 9) -r(10^(n-1), 9) +`if`(n=1, 1, 0):

seq(a(n), n=1..60);

CROSSREFS

Column k=9 of A216653.

Sequence in context: A015879 A230000 A016242 * A321396 A141747 A239706

Adjacent sequences:  A216656 A216657 A216658 * A216660 A216661 A216662

KEYWORD

nonn,base

AUTHOR

Alois P. Heinz, Sep 12 2012

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified September 28 14:14 EDT 2022. Contains 357070 sequences. (Running on oeis4.)