id:A094681 - OEIS Search Results

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Smallest number <>n, not occurring earlier and having as many distinct prime factors as n has, but none in common; a(1) = 1.

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1, 3, 2, 5, 4, 10, 8, 7, 11, 6, 9, 14, 16, 12, 18, 13, 19, 15, 17, 21, 20, 24, 25, 22, 23, 28, 29, 26, 27, 42, 32, 31, 34, 33, 36, 35, 41, 39, 38, 44, 37, 30, 47, 40, 46, 45, 43, 50, 53, 48, 52, 51, 49, 55, 54, 57, 56, 62, 61, 66, 59, 58, 65, 67, 63, 60, 64, 69, 68, 78, 73, 74 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Self-inverse integer permutation: a(a(n))=n.`
	LINKS	`Index entries for sequences that are permutations of the natural numbers`
	CROSSREFS	`Cf. A001221.` `Sequence in context: A095720 A115297 A054430 this_sequence A054158 A054160 A054080` `Adjacent sequences: A094678 A094679 A094680 this_sequence A094682 A094683 A094684`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Jun 08 2004`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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