A133425 - OEIS

A133425

Analog of A006684 for the 7x+1 problem (cf. A133421).

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

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

CROSSREFS

Cf. A133421, A133426, A133419, ...

Sequence in context: A032672 A235806 A238501 * A103802 A038984 A165549

Adjacent sequences: A133422 A133423 A133424 * A133426 A133427 A133428

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Nov 27 2007

STATUS

approved