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OMM 2013 Problem 5

    Una pareja de enteros es especial si es de la forma (n,n−1)(n, n-1) o de la forma (n−1,n)(n-1, n) con nn un entero positivo. Muestra que una pareja (n,m)(n, m) de enteros positivos que no es especial, se puede representar como suma de dos o más parejas especiales diferentes si y sólo si los enteros nn y mm satisfacen la desigualdad n+m≥(n−m)2n + m \geq (n-m)^2.

    Official text Mexican Mathematical Olympiad 2013 official paper, page 2. Quoted with source.

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