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The collatz sequence is a cool math concept that shows that with a certain algorithm, every number can lead back to one. If it's a even number, you divide it by 2. If it's a odd number, you multiply it by three, and add one. After some time, it will always lead back to one. Scientists and mathematicians have tested this with fancy computers that can go through a lot of numbers. So far, no number has been found to not lead to 1.