update

Task/Generator-Exponential/C-sharp/generator-exponential.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+static class Program {
+    static void Main() {
+        Func<int, IEnumerable<int>> ms = m => Infinite().Select(i => (int)Math.Pow(i, m));
+        var squares = ms(2);
+        var cubes = ms(3);
+        var filtered = squares.Where(square => cubes.First(cube => cube >= square) != square);
+        var final = filtered.Skip(20).Take(10);
+        foreach (var i in final) Console.WriteLine(i);
+    }
+
+    static IEnumerable<int> Infinite() {
+        var i = 0;
+        while (true) yield return i++;
+    }
+}