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A121510 Conjectured to be complete list of cycle lengths for 3x+1 (or Collatz) problem. 1
1, 2, 3, 5, 18 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

CROSSREFS

Sequence in context: A127837 A004249 * A132346 A041293 A041713 A042555

Adjacent sequences:  A121507 A121508 A121509 * A121511 A121512 A121513

KEYWORD

nonn

AUTHOR

Daniel Asimov (dasimov(AT)earthlink.net), Sep 17 2006

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Last modified February 16 21:51 EST 2012. Contains 205978 sequences.