A Converging Series Problem

Calculus Level 4

For each positive integer n n , let a ( n ) a(n) be the number of zeros in the base 3 3 representation of n n . For which positive real numbers does the series n = 1 x a ( n ) n 3 \begin{aligned}{ \large \sum_{n=1}^{\infty} \frac{x^{a(n)}}{n^3}}\end{aligned} converge?

x < 25 x<25 x > 25 x>25 x 25 x\leq25 x 25 x\geq25

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