This magic square has been known since ancient times. Each row, column and diagonal of three numbers adds to the same magic constant, 15. There is, however, a different type of 3×3 magic square, in ...

For thousands of years people have played with magic squares—arrays of distinct numbers whose rows, columns and diagonals add to the same total.* A simple 3-by-3 array that sums to 15 every which way ...