In class, we looked at this hailstone sequence. It is called a hailstone sequence because the numbers go up and down again like the formation of hailstones. It is also called the Collatz conjecture, named after Luthar Collatz of Germany, who proposed the conjecture in 1937. A conjecture is an idea that you think might be true but you do not know for sure. The conjecture states you must begin with any positive integer n: If it is an even number then halve it, or if it is an odd number then triple it and add 1. Do this recursively (over and over), and your result should always reach 1.
Check your hailstone sequences with this evaluator!
Look at this video for more thoughts on this unsolved problem.