Whats the smallest number ("the magic number") that can satisfy these conditions?
- its positive
- it is not divisible by any number below 20 (excluding 1)
- the average of the digits is an even number between 3 and 9
(In reply to solution
The lowest non-prime meeting the criteria is 1357 = 23 * 59.
Posted by Charlie
on 2004-03-17 09:02:15