Prime-counting function
Function representing the number of primes less than or equal to a given number / From Wikipedia, the free encyclopedia
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"Π(x)" redirects here. For the variant of the gamma function, see Gamma function § Pi function.
In mathematics, the prime-counting function is the function counting the number of prime numbers less than or equal to some real number x.[1][2] It is denoted by π(x) (unrelated to the number π).
This article uses technical mathematical notation for logarithms. All instances of log(x) without a subscript base should be interpreted as a natural logarithm, commonly notated as ln(x) or loge(x).