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Calculus Level 5

\[\sum_{n=1}^{\infty}\left(\sum_{k_{1}=1}^{n}\frac{1}{k_{1}}\right)\left(\sum_{k_{2}=1}^{\infty}\frac{1}{(n+k_{2})^3}\right)=2\zeta{(a) }-\zeta{(a-1) }\]

Find \(2a\).

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