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 A164912 Dual EKG: EKG for 2*A000027 = A008619 instead of A000027. 0
 1, 1, 2, 3, 2, 5, 6, 4, 5, 3, 8, 9, 7, 4, 11, 12, 8, 10, 11, 6, 17, 14, 15, 13, 18, 14, 13, 7, 20, 18, 16, 17, 9, 26, 21, 19, 10, 29, 23, 20, 22, 23, 12, 35, 24, 25, 26, 27, 28, 25, 32, 30, 28, 33, 35, 29, 15, 44, 33, 31, 16, 47, 36, 32, 34, 37, 19, 56 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS First occurrence of n have ranks: 1, 3, 4, 8, 6, 7, 13, 11, 12, 18, ... Second occurrence of n have ranks: 2, 5, 10, 14, 9, 20, ... Triples of the form (a, b, a+b): (1,1,2), (3,2,5), (5,3,8), (7,4,11), (11,6,17), ... give sequence 2, 5, 8, 11, 17, .... Every positive integer appears exactly twice. - Charlie Neder, Jan 12 2019 LINKS FORMULA a(n) = A008619(A064413(n)-1) = ceiling(A064413(n)/2). - Charlie Neder, Jan 12 2019 CROSSREFS Cf. A000027, A008619, A064413. Sequence in context: A070673 A070669 A218613 * A289386 A088861 A088631 Adjacent sequences:  A164909 A164910 A164911 * A164913 A164914 A164915 KEYWORD nonn,uned AUTHOR Paul Curtz, Aug 31 2009 EXTENSIONS More terms from Charlie Neder, Jan 12 2019 STATUS approved

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Last modified June 25 10:28 EDT 2021. Contains 345453 sequences. (Running on oeis4.)