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One digit answer (Posted on 2017-11-08) Difficulty: 2 of 5
How many a 3x3 magic squares using only the 1st nine non-composite numbers exist?

No Solution Yet Submitted by Ady TZIDON    
Rating: 3.0000 (1 votes)

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solution Comment 3 of 3 |
Given the set 1,2,3,5,7,11,13,17,19.

One row will contain 2 and two odd numbers, summing to an even number, while the other two rows will contain three odd numbers, summing to an odd number, so they will never equal and the answer is zero.

Edited on November 8, 2017, 4:43 pm
  Posted by xdog on 2017-11-08 16:42:21

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