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An Image from the Collatz Problem
By Andrew Shapira. The intensity of a point denotes the time taken to terminate.
The Generalised 3x+1 Problem
A survey by Keith Matthews [PDF].
The Collatz Problem, Data and Models
Properties and predictive models for the Collatz Problem and relative functions.
The Structure of the 3x + 1 Function
Papers by Peter Schorer describing several new approaches.
Collatz Problem
From Eric Weissten's World of Mathematics. Article with references and links.
The 3x+1 Problem Search Results
Maximum number tested (N): 91ยท2^50 = 102456891522678784.
The 3x+1 Problem Annotated Bibliography
By Jeffrey Lagarias, 1997.
Collatz 3n+1 Problem Structure
Observations posted by Ken Conrow to stimulate further research.
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