A087670 - OEIS

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A087670

The first integer in the sequence defined by b(0)=(2n+1)/n and b(k+1)=b(k)*floor(b(k)) for k>=0.

3, 5, 336, 18, 8003163168, 86632, 7191948600, 17, 72960 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,1`
	COMMENTS	`a(10) ~= 2.767*10^155 is too large to show here.` `It is conjectured that an integer is always reached if the initial value is >= 2.`
	LINKS	`Table of n, a(n) for n=1..9.` `J. C. Lagarias and N. J. A. Sloane, Approximate squaring (pdf, ps), Experimental Math., 13 (2004), 113-128.`
	CROSSREFS	`Cf. A087669 (steps to reach an integer), A087666.` `Sequence in context: A087368 A309740 A280035 * A271390 A138584 A277995` `Adjacent sequences: A087667 A087668 A087669 * A087671 A087672 A087673`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane, Sep 27 2003`
	STATUS	`approved`

Last modified February 28 08:40 EST 2021. Contains 341695 sequences. (Running on oeis4.)