Can you fill a 4x4 square so each row and each column forms a prime number? And a 5x5 square?
Note: in both cases, there should be no duplicate rows or duplicate columns. Also, numbers cannot start with a 0. Finally, all digits from 0 to 9 should be used at least once.
(In reply to re(2): Sorry, FK, I have no time, but ...
What I originally posted here ("The larger the array, the easier the problem becomes") is not true.
I must have been thinking of something else.
Edited on July 19, 2005, 11:59 pm
Posted by Penny
on 2005-07-19 23:58:05