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This is a small one. Some time ago this table came in handy, testing out low level multiplication.
And I just love multiplication tables. We all do, now don't we? :)

using System;

namespace HexMultiplicationTable
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hexadecimal multiplication table.");
            Console.WriteLine();
            for (int i = 1; i <= 16; i++)
            {
                for (int j = 1; j <= 16; j++)
                {
                    if (i == j) Console.BackgroundColor = ConsoleColor.Gray;
                    else Console.BackgroundColor = ConsoleColor.Cyan;
                    Console.Write("{0,4:X}", i * j);
                }
                //go to the next line to start for j loop all over, with i+1 
                Console.WriteLine(); 
            }
            Console.WriteLine();
            Console.WriteLine("The squares of the first 16 numbers:");
            Console.WriteLine();
            for (int j = 1; j <= 16; j++)
            {
                Console.Write("{0,4}", j * j);
            }
            Console.WriteLine();
            Console.WriteLine("**************************************************");
            
            Console.ReadKey();
        }
    }
}
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