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Everett, C.J. (1977) Iteration of the Number Theoretic Function f(2n) = n, f(2n + 1) = 3n + 2. Advances in Mathematics, 25, 42-45.
https://doi.org/10.1016/0001-8708(77)90087-1

has been cited by the following article:

• TITLE: Collatz Sequences and Characteristic Zero-One Strings: Progress on the 3x + 1 Problem

  AUTHORS: David C. Kay

  KEYWORDS: Generator, Resultant, 3x + 1 Cycle

  JOURNAL NAME: American Journal of Computational Mathematics, Vol.11 No.3, September 30, 2021

  ABSTRACT: The unsolved number theory problem known as the 3x + 1 problem involves sequences of positive integers generated more or less at random that seem to always converge to 1. Here the connection between the first integer (n) and the last (m) of a 3x + 1 sequence is analyzed by means of characteristic zero-one strings. This method is used to achieve some progress on the 3x + 1 problem. In particular, the long-standing conjecture that nontrivial cycles do not exist is virtually proved using probability theory.