A139391 - OEIS

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A139391

Next odd term in Collatz trajectory with starting value n.

1, 1, 5, 1, 1, 3, 11, 1, 7, 5, 17, 3, 5, 7, 23, 1, 13, 9, 29, 5, 1, 11, 35, 3, 19, 13, 41, 7, 11, 15, 47, 1, 25, 17, 53, 9, 7, 19, 59, 5, 31, 21, 65, 11, 17, 23, 71, 3, 37, 25, 77, 13, 5, 27, 83, 7, 43, 29, 89, 15, 23, 31, 95, 1, 49, 33, 101, 17, 13, 35, 107, 9, 55, 37, 113, 19, 29 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,3`
	COMMENTS	`a(n) = A006370(n) iff n mod 4 = 2;` `a(A016825(n))=A006370(A016825(n));` `a(n) = A000265(A006370(n)).` `a(A160967(n)) = 1. [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 31 2009]`
	REFERENCES	`Friedrich L. Bauer, 'Der (ungerade) Collatz-Baum', Informatik Spektrum 31 (Springer, April 2008).`
	LINKS	`R. Zumkeller, Table of n, a(n) for n = 1..10000` `Eric Weisstein's World of Mathematics, Collatz Problem` `Index entries for sequences related to 3x+1 (or Collatz) problem` `Wikipedia, Collatz conjecture [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 31 2009]`
	FORMULA	`a(n) = if A006370(n) is odd then A006370(n) else a(A006370(n)).`
	CROSSREFS	`Sequence in context: A154740 A179261 A154567 * A196612 A110635 A179773` `Adjacent sequences: A139388 A139389 A139390 * A139392 A139393 A139394`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Apr 17 2008`

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Last modified February 17 02:08 EST 2012. Contains 205978 sequences.