id:A087975 - OEIS Search Results

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a(n) is the smallest number such that in the 3x+1 trajectory of which the largest number of prime-factors arising in the terms of iteration list equals n.

+0
2

1, 2, 3, 15, 210, 703 (list; graph; listen)

	OFFSET	`0,2`
	EXAMPLE	`n=5: a(5)=703 because in iteration list of 703 the term 93940=2.2.5.7.11.61 arises with 5 distinct prime factors first time.`
	CROSSREFS	`Cf. A087974.` `Sequence in context: A091835 A131612 A162102 this_sequence A162103 A162104 A162105` `Adjacent sequences: A087972 A087973 A087974 this_sequence A087976 A087977 A087978`
	KEYWORD	`more,nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Sep 25 2003`

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Last modified December 20 13:54 EST 2009. Contains 171081 sequences.

AT&T Labs Research