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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A113022 a(n) = sorted union of 2^k (mod 10^n), 0<k<=5^n. 2
4, 21, 102, 503, 2504, 12505, 62506, 312507, 1562508, 7812509, 39062510, 195312511 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(n+1)/a(n)~5.

LINKS

Table of n, a(n) for n=1..12.

MATHEMATICA

Do[ Print[ Length[ Union[ Table[ PowerMod[2, i, 10^n], {i, 5^n}]] ]], {n, 10}]

CROSSREFS

Cf. A095810, A113023.

Sequence in context: A076901 A080043 A240456 * A291184 A014986 A015531

Adjacent sequences:  A113019 A113020 A113021 * A113023 A113024 A113025

KEYWORD

nonn

AUTHOR

Paul D. Hanna and Robert G. Wilson v, Aug 27 2004

EXTENSIONS

a(11) & a(12) from Robert G. Wilson v, Sep 16 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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified November 17 00:08 EST 2019. Contains 329209 sequences. (Running on oeis4.)