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A075488
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Length of iteration list when Collatz-function is iterated with initial value -1+3^n.
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7
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2, 4, 11, 10, 97, 96, 33, 32, 44, 43, 135, 134, 133, 132, 100, 99, 191, 190, 140, 139, 262, 261, 428, 427, 395, 394, 331, 330, 391, 390, 389, 388, 462, 461, 460, 459, 458, 457, 456, 455, 454, 453, 501, 500, 499, 498, 497, 496, 495, 494, 493, 492, 747, 746
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OFFSET
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1,1
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COMMENTS
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n=3, -1+3^n = 26, list = {26,13,40,20,10,5,16,8,4,2,1}, a(3)=11.
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LINKS
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FORMULA
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MATHEMATICA
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lcoll[n_] := Length[NestWhileList[If[EvenQ[#], #/2, 3 # + 1] &, n, # > 1 &]]; Table[lcoll[3^i - 1], {i, 54}] (* Jayanta Basu, Jun 15 2013 *)
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CROSSREFS
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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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