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Some Thoughts on the Search for $5 \times 5$ and $6 \times 6$ Additive-Multiplicative Magic Squares (2311.06326v1)

Published 10 Nov 2023 in math.GM

Abstract: An additive-multiplicative magic square is a square grid of numbers whose rows, columns, and long diagonals all have the same sum (called the magic sum) and the same product (called the magic product). There are numerous open problems about magic squares by Christian Boyer on multimagie.com. One such problem is to construct or prove the impossibility of a $5 \times 5$ or $6 \times 6$ additive-multiplicative magic square of distinct positive integers. Here, we present a possible approach to this problem and some partial results. We observe that such a square can be described by a form determined by the prime factorizations of its entries and that identifying these forms might be helpful in finding such a square or ruling out specific magic products.

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