id:A064419 - OEIS Search Results

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a(n) = n for n <= 5; for n > 5, a(n) = smallest number not already used such that GCD{ a(n), a(n-1) } >= 5.

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1, 2, 3, 4, 5, 10, 15, 20, 25, 30, 6, 12, 18, 9, 27, 36, 24, 8, 16, 32, 40, 35, 7, 14, 21, 28, 42, 48, 54, 45, 50, 55, 11, 22, 33, 44, 66, 60, 65, 13, 26, 39, 52, 78, 72, 56, 49, 63, 70, 75, 80, 64, 88, 77, 84, 90, 81, 99, 108, 96, 102, 17, 34, 51, 68, 85, 95, 19, 38, 57, 76, 114, 120 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`A permutation of the natural numbers.`
	LINKS	`J. C. Lagarias, E. M. Rains and N. J. A. Sloane, The EKG sequence, Exper. Math. 11 (2002), 437-446.` `Index entries for sequences related to EKG sequence` `Index entries for sequences that are permutations of the natural numbers`
	CROSSREFS	`Cf. A064413. See A064959 for inverse permutation.` `Sequence in context: A074821 A076707 A032940 this_sequence A032543 A140730 A134220` `Adjacent sequences: A064416 A064417 A064418 this_sequence A064420 A064421 A064422`
	KEYWORD	`nonn,nice,easy`
	AUTHOR	`Jonathan Ayres (Jonathan.ayres(AT)btinternet.com), Sep 30 2001`
	EXTENSIONS	`More terms from Naohiro Nomoto (n_nomoto(AT)yabumi.com), Sep 30 2001`

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Last modified September 7 12:28 EDT 2008. Contains 143483 sequences.

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