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I'm trying to find a general formula for an algebraic equation, I'm studying the behavior of [itex]∏_{i=2}^n(1-\frac{1}{i^m})[/itex] for m=3 and so far I've seen that I can find a general formula if n^2 + n + 1 produces only prime numbers. if not, it would get way harder to find a general formula for it by my intuitive method. Does anyone have any ideas? Do you know a counter-example? I've tried n=1,2,3,4,5,6 and it seems fine. I think a counter-example wouldn't be so easy to find. anyone can help?

For the experts on this forum who are into number theory, is there a polynomial of any degree that produces only prime numbers?

For the experts on this forum who are into number theory, is there a polynomial of any degree that produces only prime numbers?

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