Sum Of Squared Reciprocals - Mobius Function

$\sum_{\mu(n)=1} \frac{1}{n^2} = \frac{A}{B\pi^C}$

Let $$\mu(n)$$ denote the möbius function, the sum is taken over all positive integers $$n$$ such that $$\mu(n)=1$$, with coprime positive integers $$A$$ and $$B.$$ Find $$A+B+C$$.

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