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OMM 2007 Problem 4

    Para un entero positivo nn se definen n1n_1 como la suma de dígitos de nn, n2n_2 como la suma de dígitos de n1n_1, y n3n_3 como la suma de dígitos de n2n_2. Por ejemplo, para n=199n = 199, n1=1991=19n_1 = 199_1 = 19, n2=1992=10n_2 = 199_2 = 10 y n3=1993=1n_3 = 199_3 = 1. Encuentra todas las parejas de enteros positivos (m,n)(m, n) tales que

    m+n=2007,m3+n3=20073.\begin{aligned} m + n &= 2007, \\ m_3 + n_3 &= 2007_3. \end{aligned}

    Official text Mexican Mathematical Olympiad 2007 official paper, page 1. Quoted with source.

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