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A182205
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Iterate the map in A006368 starting at 40.
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19
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40, 60, 90, 135, 101, 76, 114, 171, 128, 192, 288, 432, 648, 972, 1458, 2187, 1640, 2460, 3690, 5535, 4151, 3113, 2335, 1751, 1313, 985, 739, 554, 831, 623, 467, 350, 525, 394, 591, 443, 332, 498, 747, 560, 840, 1260, 1890, 2835, 2126, 3189, 2392, 3588, 5382
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OFFSET
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0,1
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COMMENTS
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Like for iterations with starting points 8 or 14, it is conjectured that also this trajectory never repeats.
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REFERENCES
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D. Gale, Tracking the Automatic Ant and Other Mathematical Explorations, A Collection of Mathematical Entertainments Columns from The Mathematical Intelligencer, Springer, 1998; see p. 16.
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LINKS
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FORMULA
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a(n+1) = A006368(a(n)), with a(0) = 40.
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MATHEMATICA
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SubstitutionSystem[{n_ :> If[EvenQ[n], 3 n/2, Round[3 n/4]]}, {40}, 60] // Flatten (* Jean-François Alcover, Mar 01 2019 *)
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PROG
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(Haskell)
a182205 n = a182205_list !! n
a182205_list = iterate a006368 40
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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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