id:A143691 - OEIS Search Results

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Lexicographically smallest permutation of the natural numbers having alternating even an odd numbers of prime factors.

+0
4

1, 2, 4, 3, 6, 5, 9, 7, 10, 8, 14, 11, 15, 12, 16, 13, 21, 17, 22, 18, 24, 19, 25, 20, 26, 23, 33, 27, 34, 28, 35, 29, 36, 30, 38, 31, 39, 32, 40, 37, 46, 41, 49, 42, 51, 43, 54, 44, 55, 45, 56, 47, 57, 48, 58, 50, 60, 52, 62, 53, 64, 59, 65, 61, 69, 63, 74, 66, 77, 67, 81, 68 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`A066829(a(n)a(n+1)) = 1; n mod 2 + A001222(a(n)) = 1;` `a(2n) = A026424(n); a(2*n-1) = A028260(n);` `inverse: A143692; a(a(n)) = A143693(n).`
	LINKS	`R. Zumkeller, Table of n, a(n) for n = 1..1000` `Index entries for sequences that are permutations of the natural numbers`
	CROSSREFS	`Sequence in context: A143692 A114792 A113324 this_sequence A129767 A119618 A113321` `Adjacent sequences: A143688 A143689 A143690 this_sequence A143692 A143693 A143694`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Aug 29 2008`

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

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