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 A169849 EKG sequence started at 9 instead of 2. 15
 9, 3, 6, 2, 4, 8, 10, 5, 15, 12, 14, 7, 21, 18, 16, 20, 22, 11, 33, 24, 26, 13, 39, 27, 30, 25, 35, 28, 32, 34, 17, 51, 36, 38, 19, 57, 42, 40, 44, 46, 23, 69, 45, 48, 50, 52, 54, 56, 49, 63, 60, 55, 65, 70, 58, 29, 87, 66, 62, 31, 93, 72, 64, 68, 74, 37, 111, 75, 78, 76, 80, 82, 41 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS A generalization of A064413. a(n) = A064413(n+1) for n > 43; a(n) = A169837(n) for n > 9. - Reinhard Zumkeller, Jul 04 2014 LINKS Reinhard Zumkeller, Table of n, a(n) for n = 1..10000 Gordon Hamilton, The EKG Sequence and the Tree of Numbers Eric Weisstein's World of Mathematics, EKG Sequence Index entries for sequences related to EKG sequence PROG (Haskell) import Data.List (delete) a169849 n = a169849_list !! (n-1) a169849_list = 9 : ekg 9 (delete 9 [2..]) where ekg x zs = f zs where f (y:ys) = if gcd x y > 1 then y : ekg y (delete y zs) else f ys -- Reinhard Zumkeller, Jul 04 2014 CROSSREFS Cf. A064413, A064417, A169837. Sequence in context: A307960 A224235 A363716 * A182547 A019737 A088543 Adjacent sequences: A169846 A169847 A169848 * A169850 A169851 A169852 KEYWORD nonn AUTHOR T. D. Noe and N. J. A. Sloane, Jun 02 2010 STATUS approved

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Last modified September 13 03:33 EDT 2024. Contains 375857 sequences. (Running on oeis4.)