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A262303 Length of sequence of lower halves of n: repeatedly apply x->floor(x/2) starting at n; a(n) = number of steps until reach one of 2,3,4. 1
0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,9

LINKS

Table of n, a(n) for n=2..88.

S. Jablan, L. H. Kauffman, and P. Lopes, The delunification process and minimal diagrams, arXiv:1406.2378 [math.GT], 2014.

S. Jablan, L. H. Kauffman, and P. Lopes, The delunification process and minimal diagrams, Topology Appl., 193 (2015), 270-289, #5531.

EXAMPLE

20->10->5->2 takes 3 steps, so a(20)=3.

CROSSREFS

Cf. A262304.

Sequence in context: A085576 A108622 A112348 * A127321 A111897 A185711

Adjacent sequences:  A262300 A262301 A262302 * A262304 A262305 A262306

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane, Sep 30 2015

EXTENSIONS

a(31)-a(88) from Hiroaki Yamanouchi, Oct 03 2015

STATUS

approved

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Last modified February 19 21:59 EST 2019. Contains 320328 sequences. (Running on oeis4.)