id:A087227 - OEIS Search Results

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Number of distinct prime factors of A087226[n], the LCM of terms in trajectory of 3x+1(function) initiated at n.

+0
2

0, 1, 3, 1, 2, 3, 6, 1, 7, 2, 5, 3, 3, 6, 6, 1, 4, 7, 7, 2, 3, 5, 5, 3, 7, 3, 37, 6, 6, 6, 35, 1, 8, 4, 4, 7, 7, 7, 12, 2, 36, 3, 8, 5, 5, 5, 35, 3, 7, 7, 8, 3, 3, 37, 35, 6, 10, 6, 11, 6, 6, 35, 36, 1, 7, 8, 9, 4, 5, 4, 34, 7, 36, 7, 5, 7, 7, 12, 12, 2, 7, 36, 35, 3, 3, 8, 11, 5, 10, 5, 32, 5, 6, 35, 35 (list; graph; listen)

	OFFSET	`1,3`
	EXAMPLE	`n=25: A087226[25]=535792400 with factor-set={2,5,11,13,17,19,29} so` `a(25)=7, while number of odd terms in the trajectory is A078219(25)=8.` `This sequence differs from A078719: a(n)<=(number of odd terms in list).`
	CROSSREFS	`Cf. A006370, A087226, A078719.` `Sequence in context: A070983 A078350 A078719 this_sequence A060477 A080890 A016468` `Adjacent sequences: A087224 A087225 A087226 this_sequence A087228 A087229 A087230`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Aug 28 2003`

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Last modified December 13 23:45 EST 2009. Contains 170824 sequences.

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