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A075108 First integer reached when starting with n/floor(log_2(n)) and iterating the map x -> x*ceiling(x) A075107(n) times, or -1 if no integer is ever reached. 2
2, 3, 2, 60, 3, 14, 8, 3, 1484710602474311520, 220, 4, 227370, 560, 5, 4, 218790, 268065, 570, 5, 1008, 33, 1458660, 6, 1925, 2093, 2268, 7, 58, 60, 62, 2016, 494764640798827359861461484, 5220768, 7 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

LINKS

Table of n, a(n) for n=2..35.

EXAMPLE

n=5: after A075107(5)=2 steps 5/floor(log_2(5)) = 5/2 -> 15/2 -> 60, therefore a(5)=60.

CROSSREFS

Cf. A075103, A075121.

Sequence in context: A178134 A291489 A075121 * A265590 A260208 A242457

Adjacent sequences:  A075105 A075106 A075107 * A075109 A075110 A075111

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Sep 02 2002

STATUS

approved

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Last modified August 14 07:04 EDT 2020. Contains 336477 sequences. (Running on oeis4.)