I'm curious if there has been any work done to compute $$\sum_{d|x} \phi(d)^n$$ for integers $n>1$? I've been looking for a while and haven't found anything in the literature. I'm specifically looking to simplify or set lower bounds on this sum. Any help would be appreciated!
2026-03-28 02:49:58.1774666198
Sum of Powers of Euler's Totient Function.
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