id:A074970 - OEIS Search Results

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Number of steps to reach the first integer starting with sigma(n)/n and iterating the map x -> x*ceiling(x), or -1 if no integer is ever reached.

+0
1

0, 1, 2, 2, 18, 0, 3, 2, 3, 3, 26, 1, 9, 3, 7, 3, 6, 3, 56, 11, 9, 15, 42, 2, 10, 3, 3, 0, 38 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`a(p) = A073524(p) for primes p.`
	EXAMPLE	`a(26)=3 since (26+13+2+1)/26=21/13 -> 42/13 -> 168/13 -> 168.`
	CROSSREFS	`Cf. A073524, A000203, A009194.` `Sequence in context: A100680 A002567 A000528 this_sequence A087338 A055735 A100304` `Adjacent sequences: A074967 A074968 A074969 this_sequence A074971 A074972 A074973`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Oct 05 2002`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.