Data commit

Task/Pernicious-numbers/C-sharp/pernicious-numbers.cs

@@ -0,0 +1,63 @@
+using System;
+using System.Linq;
+
+namespace PerniciousNumbers
+{
+    class Program
+    {
+        public static int PopulationCount(long n)
+        {
+            int cnt = 0;
+            do
+            {
+                if ((n & 1) != 0)
+                {
+                    cnt++;
+                }
+            } while ((n >>= 1) > 0);
+
+            return cnt;
+        }
+
+         public static bool isPrime(int x)
+        {
+            if (x <= 2 || (x & 1) == 0)
+            {
+                return x == 2;
+            }
+
+            var limit = Math.Sqrt(x);
+            for (int i = 3; i <= limit; i += 2)
+            {
+                if (x % i == 0)
+                {
+                    return false;
+                }
+            }
+
+            return true;
+        }
+
+        private static IEnumerable<int> Pernicious(int start, int count, int take)
+        {
+            return Enumerable.Range(start, count).Where(n => isPrime(PopulationCount(n))).Take(take);
+        }
+
+        static void Main(string[] args)
+        {
+            foreach (var n in Pernicious(0, int.MaxValue, 25))
+            {
+                Console.Write("{0} ", n);
+            }
+
+            Console.WriteLine();
+
+            foreach (var n in Pernicious(888888877, 11, 11))
+            {
+                Console.Write("{0} ", n);
+            }
+
+            Console.ReadKey();
+        }
+    }
+}