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TR-MO-R1 2016 Problem 6

    nn bir pozitif tam sayı ve a1,a2,…,ana_1, a_2, \ldots, a_n birer tam sayı olmak üzere her i=1,2,…,ni = 1, 2, \ldots, n için bi=ai2b_i = a_i^2 olarak tanımlanıyor. Hiçbir (a1,a2,…,an)(a_1, a_2, \ldots, a_n) tam sayı n-lisi için 2b1+2b2+⋯+2bn−n22^{b_1} + 2^{b_2} + \cdots + 2^{b_n} - n^2 ifadesi 7 ile tam bölünmüyorsa nn kaç farklı değer alabilir?

    a) 1 b) 2 c) 3 d) 4 e) Sonsuz çoklukta

    Official text Turkish Mathematical Olympiad, first round 2016 official paper, page 4. Quoted with source.

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