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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

%I

%S 2,3,2,60,3,14,8,3,1484710602474311520,220,4,227370,560,5,4,218790,

%T 268065,570,5,1008,33,1458660,6,1925,2093,2268,7,58,60,62,2016,

%U 494764640798827359861461484,5220768,7

%N 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.

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

%Y Cf. A075103, A075121.

%K nonn

%O 2,1

%A _Reinhard Zumkeller_, Sep 02 2002

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Last modified September 19 20:55 EDT 2020. Contains 337182 sequences. (Running on oeis4.)