id:A080782 - OEIS Search Results

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a(1)=1, a(n)=a(n-1)-1 if n is already in the sequence, a(n)=a(n-1)+2 otherwise.

+0
5

1, 3, 2, 4, 6, 5, 7, 9, 8, 10, 12, 11, 13, 15, 14, 16, 18, 17, 19, 21, 20, 22, 24, 23, 25, 27, 26, 28, 30, 29, 31, 33, 32, 34, 36, 35, 37, 39, 38, 40, 42, 41, 43, 45, 44, 46, 48, 47, 49, 51, 50, 52, 54, 53, 55, 57, 56, 58, 60, 59, 61, 63, 62, 64, 66, 65, 67, 69, 68 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Permutation of the integers: exchange trisections starting with 2 and 3.` `a(a(n)) = n. - Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Oct 29 2004`
	LINKS	`Index entries for sequences that are permutations of the natural numbers`
	FORMULA	`a(n)-n is periodic with period 3.` `a(n) = n + ((n+1) mod 3), with n>=0. - Paolo P. Lava (ppl(AT)spl.at), Jun 26 2007`
	CROSSREFS	`Cf. A079357, A079354, A080783, A064437.` `Equals A064429(n-1) + 1. Cf. A004442, A080412.` `Adjacent sequences: A080779 A080780 A080781 this_sequence A080783 A080784 A080785` `Sequence in context: A059320 A129601 A049831 this_sequence A116941 A116942 A093573`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Mar 07 2003`

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Last modified October 13 20:18 EDT 2008. Contains 145016 sequences.

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