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# The error term in the Prime Number Theorem

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The Riemann hypothesis is equivalent to the following statement.
For every positive $\epsilon$, the number $\pi (x)$ of prime numbers $\leq x$ is
$$
Li (x) + O(x^{1/2 + \epsilon}).
$$
Here $Li$ is the ``Logarithmic integral'' function, defined by
$$
Li(x) := \int_0^x \frac{dt}{\log t},
$$
the integral being evaluated in principal value in the neighbourhood of $x=1$.
Roughly speaking, it means that the first half of the digits of the n-th prime are those of $Li^{-1}(n)$.
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