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We know it converges for any prime p. I just want to know how to compute its exact value: \prod_{n=1}^{\infty} $$\prod_{n=1}^{\infty} (1-p^{-n})1-p^{-n})$$

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How to compute \prod_{n=1}^{\infty} (1-p^{-n})

We know it converges for any prime p. I just want to know how to compute its exact value: \prod_{n=1}^{\infty} (1-p^{-n})