Enigma 1621: Times square
20 December 2011
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From New Scientist #2786, 13th November 2010 [link]
Penny thinks she knows everything about “Magic” squares, so Joe suggested she might design a three-by-three “Times” square, where the products of the three numbers in each row, column and main diagonal are all the same. The only other requirement was that all the numbers had to be different integers. Penny found there are many such squares with different products.
What is the smallest product for a three-by-three “Times” square?