books.google.com - The $3x 1$ problem, or Collatz problem, concerns the following seemingly innocent arithmetic procedure applied to integers: If an integer $x$ is odd then ""multiply by three and add one"", while if it is even then ""divide by two"". The $3x 1$ problem asks whether, starting from any positive integer,...https://books.google.com/books/about/The_Ultimate_Challenge.html?id=hekJ7JDMEVkC&utm_source=gb-gplus-shareThe Ultimate Challenge

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