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A257699 Number of steps from n to 0 using this algorithm:  x -> floor(r*x) if x is odd, and x -> floor(x/r) if x is even, where r = 5/2. 3
2, 1, 7, 3, 5, 2, 6, 8, 10, 4, 14, 4, 6, 6, 10, 3, 5, 7, 13, 9, 11, 9, 13, 11, 13, 5, 13, 15, 17, 5, 9, 5, 7, 7, 13, 7, 9, 11, 15, 4, 6, 4, 18, 6, 8, 8, 12, 14, 16, 10, 16, 10, 12, 12, 16, 10, 12, 14, 22, 12, 14, 12, 16, 14, 16, 6, 12, 14, 16, 16, 20, 16, 18 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Clark Kimberling, Table of n, a(n) for n = 1..10000

EXAMPLE

5->12->4->1->2->0, total of 5 steps, so that a(5) = 5.

MATHEMATICA

r = 5/2; f[x_] := If[OddQ[x], Floor[r *x], Floor[x/r]]

g[x_] := Drop[FixedPointList[f, x], -1];

Table[-1 + Length[g[n]], {n, 1, 200}]

CROSSREFS

Cf. A257698, A257700-A257706.

Sequence in context: A214550 A120903 A180335 * A160535 A258235 A021050

Adjacent sequences:  A257696 A257697 A257698 * A257700 A257701 A257702

KEYWORD

nonn,easy

AUTHOR

Clark Kimberling, May 04 2015

STATUS

approved

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Last modified December 10 05:49 EST 2018. Contains 318044 sequences. (Running on oeis4.)