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December 19th, 2018, 02:33 AM   #1
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Direct Proof

It assumes that n = r*s and check whether r is a prime number or not, but why it does not require to check whether s is a prime number.

Moreover, the last paragraph says there are at most n-2 possible values. What does this sentence mean? Thank you.
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December 19th, 2018, 05:02 AM   #2
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Can you have another go at scanning it in?
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December 19th, 2018, 05:29 AM   #3
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Sorry, it is my bad. Hope it is better.
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