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A075120 Number of steps to reach the first integer (= A075121(n)) starting with n/floor(sqrt(n)) and iterating the map x -> x*ceiling(x), or -1 if no integer is ever reached. 2
0, 0, 0, 0, 2, 0, 1, 0, 0, 5, 2, 0, 3, 2, 0, 0, 3, 3, 2, 0, 2, 1, 3, 0, 0, 8, 3, 5, 2, 0, 3, 2, 5, 3, 0, 0, 6, 2, 2, 4, 2, 0, 5, 3, 1, 4, 2, 0, 0, 7, 12, 5, 11, 12, 2, 0, 4, 3, 9, 12, 6, 16, 0, 0, 3, 7, 8, 4, 4, 4, 2, 0, 2, 4, 5, 1, 5, 2, 5, 0, 0, 7, 3, 22, 3, 3 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

COMMENTS

Starting with A073890(n)/A075119(n).

LINKS

Table of n, a(n) for n=1..86.

EXAMPLE

a(13)=3 since 13/floor(sqrt(13)) = 13/3 -> 65/3 -> 1430/3 -> 227370 = A075121(13).

CROSSREFS

Cf. A068119, A073524, A075102, A075107, A075121.

Sequence in context: A281442 A256038 A050327 * A327751 A111593 A111594

Adjacent sequences:  A075117 A075118 A075119 * A075121 A075122 A075123

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Sep 03 2002

EXTENSIONS

More terms from Jinyuan Wang, Jan 15 2022

STATUS

approved

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Last modified August 15 07:14 EDT 2022. Contains 356128 sequences. (Running on oeis4.)