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, 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

Offset: 2

Author

Reinhard Zumkeller, Sep 02 2002

Keywords

• nonn

Examples

			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.