login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
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. 1
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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

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