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 A185589 Iterate the map in A006369 starting at 144. 19
 144, 96, 64, 85, 113, 151, 201, 134, 179, 239, 319, 425, 567, 378, 252, 168, 112, 149, 199, 265, 353, 471, 314, 419, 559, 745, 993, 662, 883, 1177, 1569, 1046, 1395, 930, 620, 827, 1103, 1471, 1961, 2615, 3487, 4649, 6199, 8265, 5510, 7347, 4898, 6531, 4354, 5805, 3870, 2580, 1720, 2293, 3057, 2038, 2717, 3623, 4831 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Lagarias, page 270, appears to imply that this trajectory has period 12 and smallest element 144, which is not true. REFERENCES J. C. Lagarias, ed., The Ultimate Challenge: The 3x+1 Problem, Amer. Math. Soc., 2010; see page 270. LINKS _Reinhard Zumkeller_, Table of n, a(n) for n = 1..10000 MATHEMATICA f[n_] := If[Mod[n, 3] == 0, 2*n/3, Round[4*n/3]]; a[1] = 144; a[n_] := a[n] = f[a[n - 1]]; Table[a[n], {n, 1, 59}]  (* Jean-François Alcover, Jun 10 2013 *) PROG (Haskell) a185589 n = a185589_list !! (n-1) a185589_list = iterate a006369 144  -- Reinhard Zumkeller, Dec 31 2011 CROSSREFS Cf. A028394, A028396, A094328, A094329, A185590. Sequence in context: A057404 A174683 A173713 * A093159 A056628 A093769 Adjacent sequences:  A185586 A185587 A185588 * A185590 A185591 A185592 KEYWORD nonn,changed AUTHOR N. J. A. Sloane, Feb 04 2011 STATUS approved

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