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+ 5 stays in the middle of every magic square of order 3. Note that the magical sum for such a square is 5*3. [Laurv]

+ 5 is the smallest number that appear in two twin Pythagorean triplets: (3, 4, 5) and (5, 12, 13). [Laurv]

+ 5 is the smallest hypotenuse of a Pythagorean triangle (3^2 + 4^2 = 5^2). [Laurv]




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