Yup - there are some other names to it too. The conjecture is also known as the 3n + 1 conjecture, the Ulam conjecture (after Stanisław Ulam), Kakutani's probl

Yup - there are some other names to it too. The conjecture is also known as the 3n + 1 conjecture, the Ulam conjecture (after Stanisław Ulam), Kakutani's problem (after Shizuo Kakutani), the Thwaites conjecture (after Sir Bryan Thwaites), Hasse's algorithm (after Helmut Hasse), or the Syracuse problem; the sequence of numbers involved is referred to as the hailstone sequence or hailstone numbers,or as wondrous numbers. http://en.wikipedia.org/wiki/Collatz_conjecture http://en.wikipedia.org/wiki/Collatz_conjecture