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Task/Almost-prime/C-sharp/almost-prime.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace AlmostPrime
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            foreach (int k in Enumerable.Range(1, 5))
+            {
+                KPrime kprime = new KPrime() { K = k };
+                Console.WriteLine("k = {0}: {1}",
+                    k, string.Join<int>(" ", kprime.GetFirstN(10)));
+            }
+        }
+    }
+
+    class KPrime
+    {
+        public int K { get; set; }
+
+        public bool IsKPrime(int number)
+        {
+            int primes = 0;
+            for (int p = 2; p * p <= number && primes < K; ++p)
+            {
+                while (number % p == 0 && primes < K)
+                {
+                    number /= p;
+                    ++primes;
+                }
+            }
+            if (number > 1)
+            {
+                ++primes;
+            }
+            return primes == K;
+        }
+
+        public List<int> GetFirstN(int n)
+        {
+            List<int> result = new List<int>();
+            for (int number = 2; result.Count < n; ++number)
+            {
+                if (IsKPrime(number))
+                {
+                    result.Add(number);
+                }
+            }
+            return result;
+        }
+    }
+}