Math-4165 · mathematics · Number theory

Math-4165

Semi-magic square of distinct positive cubes

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Statement

Definitions and mathematical statement

Shared notation.
$\mathbb N=\{1,2,\ldots\}$, and $\mathbb Z,\mathbb Q,\mathbb R,\mathbb C$ denote the integers, rationals, reals and complex numbers. Any other conventions are specified locally.

For $1\le i,j\le3$, let $a_{ij}$ be positive integers, with all nine $a_{ij}$ pairwise distinct. A $3\times3$ array of cubes is semi-magic when all row sums and all column sums equal the same integer $M$.

Statement recorded in the supplied source.
Do there exist such $a_{ij}$ and $M\in\mathbb N$ with \[ \sum_{j=1}^{3}a_{ij}^{3}=M\quad(i=1,2,3),\qquad \sum_{i=1}^{3}a_{ij}^{3}=M\quad(j=1,2,3)? \] Construct an example or prove there is none. [S2]

Short English statement

Find a three-by-three array of nine distinct positive cubes with every row and every column having the same sum, or prove no such array exists.

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Catalogue entry

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