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A087975 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.

Adjacent sequences: A087972 A087973 A087974 this_sequence A087976 A087977 A087978

Sequence in context: A107413 A091835 A131612 this_sequence A097655 A080749 A070973

KEYWORD

more,nonn

AUTHOR

Labos E. (labos(AT)ana.sote.hu), Sep 25 2003

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Last modified October 7 08:31 EDT 2008. Contains 144667 sequences.


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