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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

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

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Last modified January 20 05:32 EST 2020. Contains 331067 sequences. (Running on oeis4.)