I haven't the faintest idea how to do this. The homework question reads:

Find all positive integer n such that

. Briefly explain why.

I know that:

- if is prime, then .
- if , where and are distinct primes, then .
- if then .
- if , where are distinct primes, then (which is really just a generalization of step 3).

I can't find any other info about

in my notes or in the chapters we've done this semester.

I only come up with the answer

. But the question wants all values of

which result in

.

How do I do this please?

Thanks