# Who's up to the challenge? 47

**Calculus**Level 4

\[\large \int_0^{2016} H_x^{(2)} \, dx \]

Let \({ H }_{ n }^{ (2) }\) be the generalized harmonic number of order \(n\) of 2, \( \displaystyle H_n ^{(2)} = \sum_{k=1}^n \dfrac 1{k^2} \).

If the integral above is equal to \( a\zeta(b) - H_c \), where \(a,b\) and \(c\) are positive integers, find \(a+b+c\).

**Notations**:

\(\zeta(\cdot) \) denotes the Riemann zeta function.

\( H_n\) denotes the \(n^\text{th} \) harmonic number, \( H_n = 1 + \dfrac12 + \dfrac13 + \cdots + \dfrac1n\).

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