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- #1

n>1 so we can write n as a product of primes, say $p_{1},....,p_{t}$ are the prime factors.

Then, using the multiplicative property, we find that

$n(1-p_{1})....(1-p_{t})=6p_{1}....p_{t}$. I've tried using odd/even arguments to deduce information about the primes but I have been unsuccessful.