id:A064418 - OEIS Search Results

Search: id:A064418

Displaying 1-1 of 1 results found.

page 1

a(1) = 1, a(2) = 2, a(3) = 3, a(4) = 4; for n > 4, a(n) = smallest number not already used such that GCD{ a(n), a(n-1) } >= 4.

+0
2

1, 2, 3, 4, 8, 12, 6, 18, 9, 27, 36, 16, 20, 5, 10, 15, 25, 30, 24, 28, 7, 14, 21, 35, 40, 32, 44, 11, 22, 33, 55, 45, 50, 60, 42, 48, 52, 13, 26, 39, 65, 70, 49, 56, 63, 54, 66, 72, 64, 68, 17, 34, 51, 85, 75, 80, 76, 19, 38, 57, 95, 90, 78, 84, 77, 88, 92, 23, 46, 69, 115, 100, 96 (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. Inverse permutation: A064958.` `Sequence in context: A046812 A164573 A004045 this_sequence A032939 A030073 A115271` `Adjacent sequences: A064415 A064416 A064417 this_sequence A064419 A064420 A064421`
	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`

page 1

Search completed in 0.002 seconds

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

AT&T Labs Research