Magic squares

Associative magic square

An associative magic square is a magic square for which each pair of numbers symmetrically opposite to the center sum up to the same value. For an n × n square, filled with the numbers from 1 to n2, this common sum must equal n2 + 1. These squares are also called associated magic squares, regular magic squares, regmagic squares, or symmetric magic squares. (Wikipedia).

Associative magic square
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Benjamin Franklin | Lo Shu Square | Parity (mathematics) | Modular arithmetic | Magic square