olymmath

PL-OM 1999 Problem 3

    Dowieść, że istnieją takie liczby naturalne n1<n2<…<n50n_1<n_2<\ldots<n_{50}, że

    n1+S(n1)=n2+S(n2)=n3+S(n3)=…=n50+S(n50) ,n_1+S(n_1)=n_2+S(n_2)=n_3+S(n_3)=\ldots=n_{50}+S(n_{50})\,,

    gdzie S(n)S(n) jest sumą cyfr liczby nn.

    Official text Polish Mathematical Olympiad 1999 official paper, page 2. Quoted with source.

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