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!)
A133425 Analog of A006684 for the 7x+1 problem (cf. A133421). 2
1, 7, 11, 19, 31, 43, 163, 283, 403, 1111, 1123, 1243, 1303, 1549, 1963, 4123, 9643, 10003, 11539, 21431, 76963, 97031, 468109, 1351963, 4553323, 4778471, 5163139, 6563551, 7618843, 45214123, 65704243, 161738803, 202903723 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
The 7x+1 map sends x to x/2 if x is even, x/3 if x is divisible by 3, x/5 if x is divisible by 5, otherwise 7x+1.
LINKS
N. J. A. Sloane, Table of n, a(n) for n=1..53 (from the web page of Tomás Oliveira e Silva)
Tomás Oliveira e Silva, The px+1 problem
CROSSREFS
Sequence in context: A032672 A235806 A238501 * A103802 A038984 A165549
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Nov 27 2007
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 April 20 17:12 EDT 2024. Contains 371845 sequences. (Running on oeis4.)