Find the nth prime

nth_prime.rs

const MAX_SIZE: usize = 110_000;

pub fn nth(n: u32) -> u32 {
    let primes = get_primes();

    match primes.get(n as usize) {
        None => {
            println!("{}nth prime not found", n);
            1
        },
        Some(prime) => *prime,
    }
}

fn get_primes() -> Vec<u32> {
    let mut candidates = [true; MAX_SIZE];

    for i in 2..candidates.len() {
        let mut j = i;

        while j < candidates.len() {
            j += i;
            if j >= candidates.len() {
                break;
            }
            candidates[j] = false;
        }
    }

    let mut primes: Vec<u32> = Vec::new();
    for i in 2..candidates.len() {
        if candidates[i] {
            primes.push(i as u32)
        }
    }
    return primes
}