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TR-MO 2005 Problem 6

    Terimleri tam sayılar olan bir (an)n=1∞(a_n)_{n=1}^{\infty} dizisinde, her n≥Nn \ge N için, an=∣{ i∣1≤i<n  ve  ai+i≥n}∣a_n = |\{\, i \mid 1 \le i < n \ \text{ ve } \ a_i + i \ge n \}| olacak şekilde bir NN pozitif tam sayısı varsa, (an)n=1∞(a_n)_{n=1}^{\infty} dizisinin en çok kaç değeri sonsuz kere alabileceğini belirleyiniz.

    Official text Turkish Mathematical Olympiad 2005 official paper, page 2. Quoted with source.

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