OMM 2013 Problem 5
Una pareja de enteros es especial si es de la forma o de la forma con un entero positivo. Muestra que una pareja 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 y satisfacen la desigualdad .
Official text Mexican Mathematical Olympiad 2013 official paper, page 2. Quoted with source.
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