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A169837 EKG sequence started at 3 instead of 2. 17
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
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
Sequence in context: A308315 A200474 A154858 * A333010 A319513 A160590
KEYWORD
nonn
AUTHOR
T. D. Noe and N. J. A. Sloane, Jun 02 2010
STATUS
approved

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Last modified March 28 20:05 EDT 2024. Contains 371254 sequences. (Running on oeis4.)