Perfect numbers: Difference between revisions

}

</lang>

===Version using Lambdas, will only work from version 3 of C# on===

<lang csharp>

static void Main(string[] args)

{

Console.WriteLine("Perfect numbers from 1 to 33550337:");

for (int x = 0; x < 33550337; x++)

{

if (IsPerfect(x))

Console.WriteLine(x + " is perfect.");

}

Console.ReadLine();

}

static bool IsPerfect(int num)

{

return Enumerable.Range(1, num - 1).Sum(n => num % n == 0 ? n : 0 ) == num;