A prime number generator written in Dart, using Euler's sieve and a wheel size of 210.

The code is based as closely as possible on hacatu's Prime-Sieve.

The performance of the prime determination is about half as fast as the C implementation. On my machine, it requires about 7.5 s (Dart) instead of 3.5 s (C) to find all primes up to 10⁹.

(Printing, however, is way slower, instead of 3.5 s for the C version, the output takes about 80 s.)

If you need more performance (about 20x) or flexibility (e.g., iterators), Kim Walisch's primesieve C/C++ library is the way to go. It also may come pre-packaged with/for your OS.

dart example/prime_sieve.dart [options] <max>

Determine primality for all numbers up to max. max should not exceed about 2⁶⁰ (or 2⁵⁰, when translating to JavaScript) or the size of your memory, whatever is smaller.

• --help: Print help
• --[no-]count: Whether to output the count of primes found. (Default: true.)
• --[no-]print: Whether to output the primes after calculating them. (Default: true.)
• --query: Whether to enter a query input loop for primality tests after possibly printing the values.