Welcome to the Nth Prime Page! Commas and scientific notation
(e.g. 1.0e12) are allowed.
Enter a value for n between 1 and 2.623.1015; the server will return the
nth prime number. For example, entering either 1,000,000,000,000 or 1.0e12 yields 'The
1,000,000,000,000th prime is 29,996,224,275,833.'
Pi function π(x)
Enter a value for x below, from 1 to
1017. The server will return π(x), the number
of primes not exceeding x. For example, entering
29,996,224,275,833 will tell you 'There are 1,000,000,000,000 primes
less than or equal to 29,996,224,275,833.'
Click below to get a "random" prime chosen from the
first 1012 primes:
For a description of the algorithm used, click
here. In short: the original text of this page, the programs and
datasets for primes below 3*1012, were provided by Andrew Booker.
The extension to the primes below 1017 used data provided by Andrey
V. Kulsha and programs by Andrew Carr, Chris K. Caldwell and Kim Walisch.