id:A139399 - OEIS Search Results

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Number of steps to reach a cycle in Collatz problem.

+0
2

0, 0, 5, 0, 3, 6, 14, 1, 17, 4, 12, 7, 7, 15, 15, 2, 10, 18, 18, 5, 5, 13, 13, 8, 21, 8, 109, 16, 16, 16, 104, 3, 24, 11, 11, 19, 19, 19, 32, 6, 107, 6, 27, 14, 14, 14, 102, 9, 22, 22, 22, 9, 9, 110, 110, 17, 30, 17, 30, 17, 17, 105, 105, 4, 25, 25, 25, 12, 12, 12, 100, 20, 113, 20 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`a(1)=a(2)=a(4)=0 as A006577(A006577(A006577(x)))=x for x=1,2,4;` `a(n) = A006577(n) - 2 for n > 2 (if the conjecture holds).`
	LINKS	`Index entries for sequences related to 3x+1 (or Collatz) problem` `Eric Weisstein's World of Mathematics, Collatz Problem`
	CROSSREFS	`Essentially the same sequence as A112695.` `Sequence in context: A161485 A062526 A019947 this_sequence A021669 A011511 A020856` `Adjacent sequences: A139396 A139397 A139398 this_sequence A139400 A139401 A139402`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Apr 18 2008`

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.

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