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FilledSmallSquare PrimePi[x] gives the number of primes less than or equal to x.

FilledSmallSquare The argument of PrimePi can be any positive real number.

FilledSmallSquare PrimePi[1] gives 0.

FilledSmallSquare See Section 3.2.4.

FilledSmallSquare Implementation Notes: see Section A.9.4.

FilledSmallSquare See also: Prime, Zeta.

FilledSmallSquare New in Version 2.

Further Examples