



 
You're right, I don't want to. You're going to! Write down 333, and try
Then change the tens digit and try
When you get to 3399, change the hundreds digit and start again at 3433, and so on. You have 2401 numbers to try  allow yourself about eight to ten fifteenminute sessions and don't work for too long at a time. Good hunting!  


Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences. 