SOLUTION: This is a Number Theory proof: If N = abc + 1, prove that (N, a) = (N, b) = (N, c) = 1. (N, a) means "the greatest common divisor of N and a." I have started the proof lik

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Question 935274: This is a Number Theory proof:
If N = abc + 1, prove that (N, a) = (N, b) = (N, c) = 1.
(N, a) means "the greatest common divisor of N and a."
I have started the proof like this:
Let d = (N, a).
Since d = (N, a), then d | N and d | a. "d divides N" and "d divides a".


Answer by KMST(5328)   (Show Source): You can put this solution on YOUR website!
Then and are integers.
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Since , , , and are all integers, so is ,
and since the product of integers and is ,
they must both be :
and more importantly .

The way that is proven for ,
it can be proven for and
(but in a raesonable world it should not be required),
because they all play the same role with different names.

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