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A075102 Number of steps to reach the first integer starting with 2^n/n and iterating the map x->x*ceiling(x), or -1 if no integer is ever reached. 4
0, 0, 1, 0, 2, 5, 5, 0, 2, 4, 1, 1, 13, 12, 3, 0 (list; graph; refs; listen; history; internal format)
OFFSET

1,5

COMMENTS

The starting value is A075101(n)/A000265(n).

LINKS

J. C. Lagarias and N. J. A. Sloane, Approximate squaring (pdf, ps), Experimental Math., 13 (2004), 113-128.

EXAMPLE

a(5)=2 since (2^5)/5 = 32/5 -> 224/5 -> 2016=A075103(5).

CROSSREFS

Cf. A073524, A068119, A075013.

Sequence in context: A128202 A061083 A177039 * A021396 A201317 A160177

Adjacent sequences:  A075099 A075100 A075101 * A075103 A075104 A075105

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Sep 02 2002

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Last modified February 15 06:55 EST 2012. Contains 205694 sequences.