nth-rust

 pub fn nth(n: u32) -> Option<u32> {
     pub fn is_prime(n: u32) -> bool {
         if n == 1 {return false};
         if n == 2 {return true};
         let sqrt_n = ((n as f32).sqrt() as u32) + 1;

         for i in 2..sqrt_n {
             if n % i == 0 {return false};
         }
         true
     }

     let mut primes = Vec::new();

     while primes.len() < n as usize {
         for n in 0..100000000 {
             if is_prime(n) { primes.push(n); }
         }
     }
     Some(primes[n as usize +1])
 }