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tiny-tim
#17
Jan9-10, 02:03 PM
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Quote Quote by kingwinner View Post
… d | n!

But we don't know what "n" is, so there does not seem to be any contradiction...?
ah, but you started with …
Quote Quote by kingwinner View Post
Proof by contradiction:
Suppose d is an integer greater than 1 that divides both n! + 1 and (n + 1)! +1
so … ?