id:A084937 - OEIS Search Results

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Smallest number which is coprime to the last two predecessors and not occurring earlier; a(1)=1, a(2)=2.

+0
6

1, 2, 3, 5, 4, 7, 9, 8, 11, 13, 6, 17, 19, 10, 21, 23, 16, 15, 29, 14, 25, 27, 22, 31, 35, 12, 37, 41, 18, 43, 47, 20, 33, 49, 26, 45, 53, 28, 39, 55, 32, 51, 59, 38, 61, 63, 34, 65, 57, 44, 67, 69, 40, 71, 73, 24, 77, 79, 30, 83, 89, 36, 85, 91, 46, 75, 97, 52, 81 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Permutation of natural numbers with inverse A084933: a(A084933(n))=A084933(a(n))=n;` `primes occur in natural order;` `it seems that there are no more fixed points than {1,2,3,8,33,39}.` `a(n) mod 2 = A011655(n+1); ABS(a(n)-n) < n; a(3n+1)>n; a(3n+2)<n. - Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Dec 16 2007`
	LINKS	`R. Zumkeller, Table of n, a(n) for n = 1..10000` `Index entries for sequences that are permutations of the natural numbers`
	CROSSREFS	`Sequence in context: A127521 A102399 A118318 this_sequence A081994 A090252 A140140` `Adjacent sequences: A084934 A084935 A084936 this_sequence A084938 A084939 A084940`
	KEYWORD	`nonn,nice`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jun 13 2003`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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