Read credits if this makes no sense... Enter a number, and the computer will do the same process as what is described in the credits.
The collatz conjecture is something that has not been proven. It basically says, "start with any number, and if it's odd, times 3 and add 1, but if it's even, divide by 2. Do the same thing with the number you just got. Keep going, until you get to 1." "But how do you know you will get to 1 each time?" you ask. That's the problem...