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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A033481 3x+1 sequence beginning at 21. 0
21, 64, 32, 16, 8, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..97.

Index entries for sequences related to 3x+1 (or Collatz) problem

MATHEMATICA

NestList[If[EvenQ[#], #/2, 3#+1]&, 21, 100] (* or *) PadRight[ {21, 64, 32, 16, 8}, 100, {2, 1, 4}] (* Harvey P. Dale, Sep 30 2018 *)

CROSSREFS

Sequence in context: A113781 A299450 A300088 * A041862 A041860 A041864

Adjacent sequences:  A033478 A033479 A033480 * A033482 A033483 A033484

KEYWORD

nonn

AUTHOR

Jeff Burch

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 19 13:11 EDT 2019. Contains 324222 sequences. (Running on oeis4.)