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TR-MO-R1 2011 Problem 27

    (an)n=1∞(a_n)_{n=1}^{\infty} gerçel sayı dizisi a1=1a_1 = 1, a3=4a_3 = 4 ve her n≥2n \ge 2 için, an+1+an−1=2an+1a_{n+1} + a_{n-1} = 2a_n + 1 koşulunu sağlıyorsa, a2011a_{2011} nedir?

    a) 220102^{2010} b) 20210562021056 c) 10105281010528 d) 30163016 e) 20112011

    Official text Turkish Mathematical Olympiad, first round 2011 official paper, page 8. Quoted with source.

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