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Prime square (Posted on 2005-07-19) Difficulty: 3 of 5
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.

No Solution Yet Submitted by Federico Kereki    
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Part One -- a solution at random | Comment 1 of 10

With first row and column chosen at random (except for avoiding digits zero) from a list of primes:

4651
2309
9587
7919

Since those numbers were chosen at random, and then the rest chosen to fit, there are probably more.


  Posted by Charlie on 2005-07-19 15:48:51
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