A075107 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

A075107

Number of steps to reach the first integer (= A075108(n)) starting with n/floor(log_2(n)) and iterating the map x -> x*ceiling(x), or -1 if no integer is ever reached.

2

0, 0, 0, 2, 0, 1, 1, 0, 5, 2, 0, 3, 2, 0, 0, 3, 3, 2, 0, 2, 1, 3, 0, 2, 2, 2, 0, 1, 1, 1, 2, 5, 3, 0, 16, 2, 4, 6, 0, 4, 16, 9, 2, 0, 1, 1, 1, 1, 0, 4, 2, 4, 8, 0, 2, 5, 2, 8, 0, 9, 3, 4, 5, 2, 0, 1, 1, 1, 1, 1, 0, 5, 7, 3, 2, 4, 0, 9, 4, 1, 2, 3, 0, 4, 1, 2, 1

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

OFFSET

2,4

COMMENTS

Starting values given by A075105(n)/A075106(n).

LINKS

Table of n, a(n) for n=2..88.

EXAMPLE

a(5)=2 since 5/floor(log_2(5)) = 5/2 -> 15/2 -> 60 = A075108(5).

CROSSREFS

Cf. A068119, A073524, A075102, A075120.

Sequence in context: A158800 A144024 A185249 * A269953 A326411 A348454

Adjacent sequences: A075104 A075105 A075106 * A075108 A075109 A075110

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Sep 02 2002

EXTENSIONS

More terms from Jinyuan Wang, Jan 15 2022

STATUS

approved