This is called the Collatz conjecture, and it still hasn't been proved: http://en.wikipedia.org/wiki/Collatz_conjecture http://en.wikipedia.org/wiki/Collatz_con

This is called the Collatz conjecture, and it still hasn't been proved: http://en.wikipedia.org/wiki/Collatz_conjecture http://en.wikipedia.org/wiki/Collatz_conjecture