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57129 resources
From Eric Weissten's World of Mathematics. Article with references and links.
Results up to 2^60 by Tomás Oliveira e Silva.
By Jeffrey Lagarias, 1997.
A paper by Craig Alan Feinstein arguing that the Collatz Conjecture cannot be formally proved.
By Andrew Shapira. The intensity of a point denotes the time taken to terminate.
A survey by Keith Matthews.
Properties and predictive models for the Collatz Problem and related functions.