Surely the Hailstone sequence just picks out an infinite list of even integers and is certain eventually to arrive at a number that is a power of 2, and then it will go to 1. How could it not end up going to 1?

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## Hailstone Sequence

Surely the Hailstone sequence just picks out an infinite list of even integers and is certain eventually to arrive at a number that is a power of 2, and then it will go to 1. How could it not end up going to 1?