Elementary functions equivalent to the prime counting function

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Could there be an elementary function $f(x)$ such that

$$ \pi(x) = f(x) $$

where $\pi(x)$ represents the number of the prime numbers up to $x$? (By elementary I mean, functions those are differantiable)

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By definition, $\pi$ is not differentiable at any point $x \in \mathcal{P}$ the set of prime numbers. So it is not possible to find such a $f$.