func nthPrimeNumber (_ n: Int) -> Int {
    var prime: Int = 0
    var divisor: Int
    var isPrime: Bool
    for prime in stride(from: 2, to: 50, by: 1) {
        isPrime = true;
        for divisor in stride(from: 2, to: prime - 1 , by: 1) {
            if ((prime % divisor) == 0 ) {
                isPrime = false
            }
        }
        if (isPrime == true ) {
           print(" \(prime)")
        }
    }
    return prime
}