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In article <4a4c3l$7se@news.tech.gakken.co.jp> yamada@tech.gakken.co.jp writes:
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>
>"Unsolved Problems in Number Theory"	Richard K.Guy
>1981 Springer-Verlag		$B!JBh#2HG$,$"$k!)!K(J
>
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>From: alopez-o@neumann.uwaterloo.ca (Alex Lopez-Ortiz)
>Subject: sci.math FAQ: Unsolved Problems
>Summary: Part 20 of 32, New version
>Message-ID: <DID14t.20C@undergrad.math.uwaterloo.ca>
>Date: Mon, 20 Nov 1995 21:02:53 GMT
>   
>                              UNSOLVED PROBLEMS
	...
>Collatz Problem
>   Take any natural number m > 0.
>   n : = m;
>   repeat
>   if (n is odd) then n : = 3*n + 1; else n : = n/2;
>   until (n==1)
>   
>   Conjecture 1 For all positive integers m, the program above
>   terminates.
>   The conjecture has been verified for all numbers up to 7 * 10^(11).
>References
>   Unsolved Problems in Number Theory. Richard K Guy. Springer, Problem E16.
>   Elementary Number Theory. Underwood Dudley. 2nd ed.

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In article <WAKAMATU.95Dec7180030@parsley.kurims.kyoto-u.ac.jp>
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