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"content": "Did you know that 276,951,438 is the smallest 9-digit number that, when written in three rows of 3, forms a 3×3 magic square?\n\nIt is also the only 3x3 normal magic square, excluding rotations and reflections.\n\nInterestingly, a normal magic square of order n, that is, a magic square which contains the integers 1,2,...,n², has magic constant M given by\n\n M = n · (n² + 1)/2\n\nFor example, the magic square in the image contains integers 1,2,..,3² and so\n\n M = 3 · (3² + 1)/2 = 3 · 10/2 = 15\n\n[Image credit: https://fermatslibrary.com]\n\nReferences\n--------------\n[1] \"Magic constant\", https://en.wikipedia.org/wiki/Magic_constant\n\n[2] \"A006003\", https://oeis.org/A006003\n\n[3] \"Notes on Magic Squares and Cubes\", https://www.trump.de/magic-squares\n\n[4] \"Magic Square\", https://mathworld.wolfram.com/MagicSquare.html\n\n#math #maths #magicsquare #magicconstant #numbertheory\n\nhttps://media.mathstodon.xyz/media_attachments/files/113/583/607/953/299/748/original/baf5296d72668ba2.jpg",
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