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A075121 First integer reached when starting with n/floor(sqrt(n)) and iterating the map x -> x*ceiling(x) A075107(n) times, or -1 if no integer is ever reached. 2
1, 2, 3, 2, 60, 3, 14, 4, 3, 1484710602474311520, 220, 4, 227370, 560, 5, 4, 218790, 268065, 570, 5, 1008, 33, 1458660, 6, 5 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..25.

EXAMPLE

n=13: after A075120(13)=3 steps 13/floor(sqrt(13)) = 13/3 -> 65/3 -> 1430/3 -> 227370, therefore a(13)=227370.

CROSSREFS

Cf. A075103, A075108.

Sequence in context: A332734 A178134 A291489 * A075108 A265590 A260208

Adjacent sequences:  A075118 A075119 A075120 * A075122 A075123 A075124

KEYWORD

nonn,more

AUTHOR

Reinhard Zumkeller, Sep 03 2002

STATUS

approved

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Last modified September 23 22:32 EDT 2020. Contains 337315 sequences. (Running on oeis4.)