using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        foreach (int prime in GetPrimes(100,200)) {

            Console.Write(prime.ToString()+" ");

        }

        Console.WriteLine();

    }

    private static List<int> GetPrimes(int lo, int hi)

    {

        var primes = new List<int> {2};

        for (int i = 3; i <= hi; i+=2) {

            var maxFactor = Math.Sqrt(i);

            foreach (int factor in primes) {

                if (factor > maxFactor) break;

                if (i % factor == 0) {

                    goto not_prime;

                }

            }

            primes.Add(i);

            not_prime:;

        }

        return primes.Where(p => lo <= p && p <= hi).ToList();

    }

}