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A007320
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Number of steps needed for juggler sequence (A094683) started at n to reach 1.
(Formerly M4047)
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19
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0, 1, 6, 2, 5, 2, 4, 2, 7, 7, 4, 7, 4, 7, 6, 3, 4, 3, 9, 3, 9, 3, 9, 3, 11, 6, 6, 6, 9, 6, 6, 6, 8, 6, 8, 3, 17, 3, 14, 3, 5, 3, 6, 3, 6, 3, 6, 3, 11, 5, 11, 5, 11, 5, 11, 5, 5, 5, 11, 5, 11, 5, 5, 3, 5, 3, 11, 3, 14, 3, 5, 3, 8, 3, 8, 3, 19, 3, 8, 3, 10, 8, 8, 8, 11, 8, 10, 8, 11, 8, 11, 8, 11, 8, 8, 8, 11
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OFFSET
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1,3
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COMMENTS
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It is not known if every starting value eventually reaches 1.
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REFERENCES
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C. Pickover, Computers and the Imagination, St. Martin's Press, NY, 1991, p. 232.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
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Giovanni Resta, Table of n, a(n) for n = 1..10000
H. J. Smith, Juggler Sequence
Eric Weisstein's World of Mathematics, Juggler Sequence
Wikipedia, Juggler sequence
R. G. Wilson, V, Letter to N. J. A. Sloane, Sep. 1992
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EXAMPLE
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The trajectory of 1 is 3, 5, 11, 36, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, ... so a(3) = 6.
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MAPLE
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A007320 := proc(n)
local a, ntrack;
a := 0 ;
ntrack := n ;
while ntrack > 1 do
ntrack := A094683(ntrack) ;
a := a+1 ;
end do:
return a;
end proc: # R. J. Mathar, Apr 19 2013
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MATHEMATICA
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js[n_] := If[ EvenQ[n], Floor[ Sqrt[n]], Floor[ Sqrt[n^3]]]; f[n_] := Length[ NestWhileList[js, n, # != 1 &]] - 1; Table[ f[n], {n, 99}] (* Robert G. Wilson v, Jun 10 2004 *)
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CROSSREFS
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Cf. A007321, A094683, A094698, A094679, A093685, A094716.
Sequence in context: A033939 A021020 A215578 * A199734 A007321 A062828
Adjacent sequences: A007317 A007318 A007319 * A007321 A007322 A007323
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane, Robert G. Wilson v, Mira Bernstein
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EXTENSIONS
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Corrected and extended by Jason Earls, Jun 09 2004
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STATUS
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approved
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