Collatz Sequence:

Write Python 3X higher.

Lets look at a simple sequence that has fascinated and foxed mathematicians for many years.

The computational rule for creating the sequence is to start from some given n, and to generate the next term of the sequence from n, either by halving n, (whenever n is even), or else by multiplying it by three and adding 1 (that is, 3n+1). The sequence terminates when n reaches 1.