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Collatz Problem

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	Collatz Problem - http://mathworld.wolfram.com/CollatzProblem.html From Eric Weissten's World of Mathematics. Article with references and links.
	The 3x+1 Problem Annotated Bibliography - http://www.math.lsa.umich.edu/~lagarias/3x+1.html By Jeffrey Lagarias, 1997.
	Computational Verification of the 3x+1 Conjecture - http://www.ieeta.pt/~tos/3x+1.html Results up to 2^60 by Tomás Oliveira e Silva.
	The Structure of the 3x + 1 Function - http://www.occampress.com/ Papers by Peter Schorer describing several new approaches.
	The Generalised 3x+1 Problem - http://www.numbertheory.org/pdfs/survey.pdf A survey by Keith Matthews.

	The 3x+1 Problem Conference Proceedings - http://www.math.grin.edu/~chamberl/conf.html Katholische Universität Eichstätt, Germany; 5--6 August 1999. On-line proceedings and group photo.
	Collatz 3n+1 Problem Structure - http://www-personal.ksu.edu/~kconrow/ Observations posted by Ken Conrow to stimulate further research.
	Experiments with the 3n+1 Sequence - http://did.mat.uni-bayreuth.de/personen/wassermann/fun/3np1_e.html An online calculator by Alfred Wassermann.
	The Collatz 3n+1 Conjecture is Unprovable - http://arxiv.org/abs/math.GM/0312309 A paper by Craig Alan Feinstein arguing that the Collatz Conjecture cannot be formally proved.
	An Image from the Collatz Problem - http://www.onezero.org/collatz-image By Andrew Shapira. The intensity of a point denotes the time taken to terminate.

The 3x + 1 Problem and its Generalizations - http://oldweb.cecm.sfu.ca/organics/papers/lagarias/
An activated-text survey article by Jeff Lagarias.

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