posted by Mark .
justify that15 is the sum of eachrow of a 3X3 magic square using the number 0-9. Find the sume of all the numbers. What is the of eachrow in a 4X4 magic square that uses the numbers 1-16.
When you study the link given by bobpursely, make a note of
Albrecht Dürer's magic square, probably the most famous 4by4 magic square.
I especially like how, in the last row, he was able to insert the date of his "Melancolia" engraving as
1 15 14 4 to stand for 1514 AD
A being the first letter of the alphabet and D being the 4th letter, with 1514 the year