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A087677 Consider recurrence b(0) = n/3, b(n) = b(0)*floor(b(n-1)); sequence gives first integer reached, or -1 if no integer is ever reached. 1
2, 21, 240, 3, 10, 11, 4, 170195636, 84, 5, 736, 922709, 6, 38, 40, 7, 374, 10751097, 8, 550, 598, 9, 84, 87, 10, 1173908, 1371360, 11, 262696240, 203210, 12, 148, 152, 13, 72879280, 2419, 14, 588799, 44088, 15, 230, 235, 16, 4263, 20523050, 17, 5096, 5300, 18, 330, 336 (list; graph; refs; listen; history; text; internal format)
OFFSET

6,1

COMMENTS

It is conjectured that an integer is always reached if the initial value is >= 2.

LINKS

Table of n, a(n) for n=6..56.

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

CROSSREFS

Cf. A087675, A087676.

Sequence in context: A134490 A045726 A105712 * A229036 A097627 A094797

Adjacent sequences:  A087674 A087675 A087676 * A087678 A087679 A087680

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, following a suggestion of Bela Bajnok (bbajnok(AT)gettysburg.edu), Sep 27 2003

STATUS

approved

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Last modified September 23 08:24 EDT 2014. Contains 247114 sequences.