Prime counting function

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The prime counting function, denoted $\pi$, is a function defined on real numbers. The quantity $\pi(x)$ is defined as the number of positive prime numbers less than or equal to $x$.

The function $\pi(x)$ is asymptotically equivalent to $x/\log x$. This is the prime number theorem. It is also asymptotically equivalent to Chebyshev's theta function.

See also

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