id:A075121 - OEIS Search Results

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First integer reached when starting with n/floor(SquareRoot(n)) and iterating the map x -> x*ceiling(x) A075107(n) times, or -1 if no integer is ever reached.

+0
3

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; listen)

	OFFSET	`1,2`
	EXAMPLE	`n=13: after A075120(13)=3 steps 13/floor(SquareRoot(13))=13/3 -> 65/3 -> 1430/3 -> 227370, therefore a(13)=227370.`
	CROSSREFS	`Cf. A075103, A075108.` `Adjacent sequences: A075118 A075119 A075120 this_sequence A075122 A075123 A075124` `Sequence in context: A136454 A025522 A019228 this_sequence A075108 A026932 A087401`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Sep 03 2002`

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Last modified October 13 20:18 EDT 2008. Contains 145016 sequences.

AT&T Labs Research