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 A169837 EKG sequence started at 3 instead of 2. 16
 3, 6, 2, 4, 8, 10, 5, 15, 9, 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) = A169849(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 PROG (Haskell) import Data.List (delete) a169837 n = a169837_list !! (n-1) a169837_list = 3 : ekg 3 (2 : [4..]) 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, A169849. Sequence in context: A308315 A200474 A154858 * A319513 A160590 A111952 Adjacent sequences:  A169834 A169835 A169836 * A169838 A169839 A169840 KEYWORD nonn AUTHOR T. D. Noe and N. J. A. Sloane, Jun 02 2010 STATUS approved

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Last modified January 24 13:24 EST 2020. Contains 331193 sequences. (Running on oeis4.)