Switching Bases

For all positive integers nn, let f3(n)f_3(n) be the representation of nn in base 33, considered as a number in base 10.10. For example, since 55 in base 3 is 12312_3, so f3(5)=12.f_3(5)=12. What is the sum of all positive integers nn such that f3(n)=8n?f_3(n)=8\cdot n?

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