Mathematicians seem to have settled on calling it the 3x+1 problem. I think this book is the edited by the current authority on the subject: http://www.amazon.

Mathematicians seem to have settled on calling it the 3x+1 problem. I think this book is the edited by the current authority on the subject: http://www.amazon.com/Ultimate-Challenge-3x-Problem/dp/0821849409 http://www.amazon.com/Ultimate-Challenge-3x-Problem/dp/08218...