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Primal Magic Square (Posted on 2004-03-09) Difficulty: 4 of 5
Find a 3x3 magic square that is composed of 9 prime numbers (not the numbers from 1-9) and show how you found it.

(A magic square, as you may already know, is one in which the respective sums of the numbers in all the rows, columns, and both major diagonals all add up to the same number.)
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Since "Magic Square" is a term used outside the scope of this problem, I'm sure you can find an answer on the internet. Please find a solution independently.

See The Solution Submitted by SilverKnight    
Rating: 3.0000 (4 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
If all goes well today..... | Comment 7 of 15 |

....by midnight I will have a Visual Basic console application that will accept a number N, then compute the first N primes (using the Sieve of Eratosthenes), then find all the 3X3 magic squares among them.

btw..."composed of 9 prime numbers (not the numbers from 1-9)"...didn't you mean to say "2-7" ? It goes without saying that 1 and 9 can't be in the solution.   

 

 

Edited on March 10, 2004, 8:11 am
  Posted by Penny on 2004-03-10 07:31:49

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