I am really stuck at a problem that asks me to find the following summation $$ \sum_{i\mid n}\phi(i)\binom{n/i}{k} $$ I would really appreciate if someone can provide me with a solution for the same . Where n/i is floor(n/i)
2026-03-26 13:01:45.1774530105
summation of a series that depends on euler totient function and binomial cofficent
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