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sieve

Sieve of Eratosthenes

This is an implementation of the sieve of Eratosthenes. It finds prime numbers for you.

Install

npm install sieve

Usage

var sieve = require('sieve');
 
// primes from 2 to 1000000 
var primes = sieve(1000000);
 
// primes from 100 to 1000000 
var primes = sieve(1000000, 100);

The sieve returns a Uint32Array, unless you are using a terrible browser, in which case you just get an ordinary array.

Perfomance

On my macbook pro, it found all primes from 2 to 100,000,000 in 2723ms.

It has memory issues with arrays much larger than that. If that is a problem, submit a pull request.