id:A026239 - OEIS Search Results

Search: id:A026239

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Beginning with the natural numbers, swap the k-th prime and k-th composite.

+0
2

1, 4, 6, 2, 8, 3, 9, 5, 7, 11, 10, 13, 12, 17, 19, 23, 14, 29, 15, 31, 37, 41, 16, 43, 47, 53, 59, 61, 18, 67, 20, 71, 73, 79, 83, 89, 21, 97, 101, 103, 22, 107, 24, 109, 113, 127, 25, 131, 137, 139, 149, 151, 26, 157, 163, 167, 173, 179 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Self-inverse permutation of natural numbers.`
	LINKS	`Index entries for sequences that are permutations of the natural numbers`
	FORMULA	`a(1) = 1 and a(n) = if n is prime then A002808(A049084(n)) else A000040(A066246(n)) for n>1. - Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Dec 13, 2001`
	CROSSREFS	`Sequence in context: A065165 A088516 A114538 this_sequence A114579 A021220 A095196` `Adjacent sequences: A026236 A026237 A026238 this_sequence A026240 A026241 A026242`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified December 11 12:57 EST 2009. Contains 170656 sequences.

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