C# Online Compiler | .NET Fiddle

using System;
using System.Collections.Generic;
//
//Borrow from https://www.dotnetperls.com/yield
//
public class Program
{
	public static IEnumerable<int> ComputePower(int number, int exponent)
    {
        //
		//Return the result with yield out of a loop. Func/Method does not stop on 'return'. Yield return, returns control to continue below.
		//
		yield return 0; 
		
		int exponentNum = 0;
        int numberResult = 1;
        //
        // Continue loop until the exponent count is reached.
        //
        while (exponentNum < exponent)
        {
            //
            // Multiply the result.
            //
            numberResult *= number;
            exponentNum++;
            //
            // Return the result with yield.
            //
            yield return numberResult;
        }
    }
	
	public static void Main()
	{
        //
        // Compute powers of two
        //
		int exponent = 0; //no access to interator
        foreach (int value in ComputePower(2, 17))
        {
            
			Console.WriteLine("2^" + (exponent++).ToString() +"="+ value);			
        }
        Console.WriteLine();
	}
}

 
using System;
using System.Collections.Generic;
//
//Borrow from https://www.dotnetperls.com/yield
//
public class Program
{
    public static IEnumerable<int> ComputePower(int number, int exponent)
    {
        //
        //Return the result with yield out of a loop. Func/Method does not stop on 'return'. Yield return, returns control to continue below.
        //
        yield return 0; 
        
        int exponentNum = 0;
        int numberResult = 1;
        //
        // Continue loop until the exponent count is reached.
        //
        while (exponentNum < exponent)
        {
            //
            // Multiply the result.
            //

Cached Result

2^0=0
2^1=2
2^2=4
2^3=8
2^4=16
2^5=32
2^6=64
2^7=128
2^8=256
2^9=512
2^10=1024
2^11=2048
2^12=4096
2^13=8192
2^14=16384
2^15=32768
2^16=65536
2^17=131072