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Name of a sequence that is unknown to stop on a given input

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Several years ago I was self learning lisp by a book which I do not remember. As an example there was a recursively defined sequence which was said to be unknown to be finite or not for every input --- to generate a sequence you were required to provide two(?) initial values. At least that is how I remember.

There was a Wikipedia article on it but I can't find it either. Does anyone know what I'm talking about?

Asked By : Yrogirg
Answered By : A.Schulz

It has many names, I first heard about it as the Syracuse problem, but the most prominent name is maybe Collatz Conjecture.

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Question Source : http://cs.stackexchange.com/questions/9084

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