**prime_pi**,
a Python code which
evaluates Pi(n), the number of primes less than or equal to an integer n.

The computer code and data files made available on this web page are distributed under the GNU LGPL license.

**prime_pi** is available in
a C version and
a C++ version and
a Fortran90 version and
a MATLAB version and
an Octave version and
a Python version.

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is_prime, a Python code which implements various versions of the sieve of Eratosthenes to determine whether a given integer is prime.

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- prime_pi.py, the source code.
- prime_pi.sh, runs all the tests.
- prime_pi.txt, the output file.