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A185590
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Iterate the map in A006369 starting at 44.
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20
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44, 59, 79, 105, 70, 93, 62, 83, 111, 74, 99, 66, 44, 59, 79, 105, 70, 93, 62, 83, 111, 74, 99, 66, 44, 59, 79, 105, 70, 93, 62, 83, 111, 74, 99, 66, 44, 59, 79, 105, 70, 93, 62, 83, 111, 74, 99, 66, 44, 59, 79, 105, 70, 93, 62, 83, 111, 74, 99, 66, 44, 59, 79, 105, 70, 93, 62, 83, 111, 74, 99, 66, 44
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refs;
listen;
history;
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OFFSET
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1,1
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COMMENTS
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Periodic with period length 12.
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REFERENCES
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A. O. L. Atkin, Comment on Problem 63-13, SIAM Rev., 8 (1966), 234-236.
J. C. Lagarias, ed., The Ultimate Challenge: The 3x+1 Problem, Amer. Math. Soc., 2010; see page 270. {beware of typo: Lagarias says the orbit of 144 (not 44) has period 12.)
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LINKS
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MATHEMATICA
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f[n_] := If[Mod[n, 3] == 0, 2*n/3, Round[4*n/3]]; a[1] = 44; a[n_] := a[n] = f[a[n - 1]]; Table[a[n], {n, 1, 73}] (* Jean-François Alcover, Jun 10 2013 *)
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PROG
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(Haskell)
a185590 n = a185590_list !! (n-1)
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CROSSREFS
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Trajectories under A006368 and A006369: A180853, A217218, A185590, A180864, A028393, A028394, A094328, A094329, A028396, A028395, A217729, A182205, A223083-A223088, A185589, A185590.
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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