This is a really fun thread. The 3x+1 problem is deceptively simple: the kind of thing anyone can understand & play with, but which the world's best mathematicians can't solve. A very brief explanation:https://twitter.com/AlexKontorovich/status/1172715174786228224 …
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Take a positive number. Let's give it a name: x. The rules of the game are this: (1) if x is even, replace it by x/2; and (2) if x is even, replace it by 3x+1. That's it, the complete rules of the game.
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