A few years back I owned a calendar made up of two dice (a bit like the image from Wikipedia) to show the day of the month. The two dice had all the digits needed to display any number from 01 to 31. It’s a neat little puzzle to ask someone if they can figure out what the numbers on each of the two dice must be for this to work.

You can probably find the answer on the web, and it took me just 30 seconds to find one.  But still, it is a fun little puzzle.

What I thought was, could I write a program to solve it? So I’m going to try it. It will be in C# to start with but if that works, I’ll redo it in C and publish both on here.