This is my first version with the 0 but it is weird tell me if you dont know
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace life
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Game of life");
            Console.WriteLine("Press Enter");
            int currentNumber = 1;
            int previousNumber = 0;
            int lifeIDK = 0;
            Console.ReadLine();

            while (currentNumber < 22)
            {

                lifeIDK = currentNumber + previousNumber;

                Console.WriteLine("value of previous Number: {0}", previousNumber);
                Console.WriteLine("value of current Number: {0}", currentNumber);
                Console.WriteLine("------------------------------\n");

                previousNumber = currentNumber;
                currentNumber = lifeIDK;

            }
            Console.ReadLine();



        }
    }
}