login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A086017 Number of 9's in decimal expansion of n^2. 20
0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 2, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 0, 2, 0, 0, 0, 0, 0, 1, 0, 0, 1, 1, 0, 1, 0, 0, 0, 1, 0, 1, 1, 2, 1, 1, 0, 0, 0, 1, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,64

LINKS

G. C. Greubel, Table of n, a(n) for n = 0..1000

MATHEMATICA

DigitCount[(Range[0, 100])^2, 10, 9] (* G. C. Greubel, Dec 13 2016 *)

PROG

(PARI) A086017(n)=#select(d->d==9, digits(n^2)) \\ M. F. Hasler, Feb 21 2016

CROSSREFS

Cf. 0's A086008, 1's A086009, 2's A086010, 3's A086011, 4's A086012, 5's A086013, 6's A086014, 7's A086015, 8's A086016.

Cf. A269249 for the n^3 analog.

Sequence in context: A108730 A056973 A107782 * A000161 A060398 A253242

Adjacent sequences:  A086014 A086015 A086016 * A086018 A086019 A086020

KEYWORD

base,nonn

AUTHOR

Jason Earls, Jul 07 2003

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 September 17 12:45 EDT 2019. Contains 327131 sequences. (Running on oeis4.)