Switching Bases

For all positive integers \(n\), let \(f_3(n)\) be the representation of \(n\) in base \(3\), considered as a number in base \(10.\) For example, since \(5\) in base 3 is \(12_3\), so \(f_3(5)=12.\) What is the sum of all positive integers \(n\) such that \(f_3(n)=8\cdot n?\)

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