Hi guys, I just have a few problems with part b) and c), I can do part a) the following is my working but I'm just not sure how to solve b) and c). Any help would be appreciated, cheers!
If we let and then since we have
Using the Mobius Inversion Theorem yields: as required.
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For (b) remember Fermat's Little Theorem, we have for all For (c) rewite it as , what are the divisors?
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