Mystery Guest from Number Theory

[Denys Duchier]

http://mathworld.wolfram.com/CollatzProblem.html variously identifies
it as Collatz's problem, Hasse's algorithm, Kakutani's problem,
Syracuse algorithm, Syracuse problem, Thwaites conjecture, and Ulam's
problem.  The element of the resulting sequence are called Hailstone
numbers.

Cheers,

-- 
Dr. Denys Duchier			Denys.Duchier at ps.uni-sb.de
Forschungsbereich Programmiersysteme	(Programming Systems Lab)
Universitaet des Saarlandes, Geb. 45	http://www.ps.uni-sb.de/~duchier
Postfach 15 11 50			Phone: +49 681 302 5618
66041 Saarbruecken, Germany		Fax:   +49 681 302 5615