primecount-rs

primecount-rs is a library that provides APIs for counting the primes below an integer x ≤ 10^31 using highly optimized implementations of the combinatorial prime counting algorithms.

It is a rust wrapper around an awesome kimwalisch/primecount library.

References:

• crates.io/crates/primecount
• docs.rs/primecount

Add to Cargo.toml of your project:

primecount = "0.2.0"

Examples:

use primecount;

fn main() {
    println!("Primes below 1000 = {}", primecount::pi(1000));
    println!(
        "Numbers below 1000 that are not divisible by 
        any of the first 100 primes (a.k.a. Legendre-sum) = {}",
        primecount::phi(1000, 100)
    );
    println!("10th prime = {}", primecount::nth_prime(10));
}

1. Install cmake
2. Update primecount dependency:

git submodule update --init --recursive

3. cargo build to build the library
4. cargo test to run the tests