A008895 - OEIS

A008895

The 3x-1 map: a(n) = n/2 if n is even, 3n-1 if n is odd.

63, 188, 94, 47, 140, 70, 35, 104, 52, 26, 13, 38, 19, 56, 28, 14, 7, 20, 10, 5, 14, 7, 20, 10, 5, 14, 7, 20, 10, 5, 14, 7, 20, 10, 5, 14, 7, 20, 10, 5, 14, 7, 20, 10, 5, 14, 7, 20, 10, 5, 14, 7, 20, 10, 5, 14, 7, 20, 10, 5

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,1

COMMENTS

This map is very similar to the Collatz map (A006370). - Sean A. Irvine, Jul 07 2025

REFERENCES

R. K. Guy, Unsolved Problems in Number Theory, E16.

LINKS

Table of n, a(n) for n=0..59.

Index entries for linear recurrences with constant coefficients, signature (0, 0, 0, 0, 1).

MATHEMATICA

PadRight[{63, 188, 94, 47, 140, 70, 35, 104, 52, 26, 13, 38, 19, 56, 28}, 120, {14, 7, 20, 10, 5}] (* Harvey P. Dale, Aug 24 2019 *)

CROSSREFS

Cf. A006370.

Sequence in context: A389176 A077263 A098140 * A359563 A008874 A045112

Adjacent sequences: A008892 A008893 A008894 * A008896 A008897 A008898

KEYWORD

nonn

AUTHOR

N. J. A. Sloane

STATUS

approved