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TR-MO-R1 2013 Problem 31

    Gerçel sayılardan oluşan (an)n=1∞(a_n)_{n=1}^{\infty} dizisi her n≥3n\geq 3 için,

    an=(n−1) a1+(n−2) a2+⋯+2 an−2+an−1a_n=(n-1)\,a_1+(n-2)\,a_2+\cdots+2\,a_{n-2}+a_{n-1}

    eşitliğini sağlamaktadır. a2011=2011a_{2011}=2011 ve a2012=2012a_{2012}=2012 ise, a2013a_{2013} nedir?

    a) 60256025 b) 55555555 c) 40254025 d) 34563456 e) 20132013

    Official text Turkish Mathematical Olympiad, first round 2013 official paper, page 9. Quoted with source.

    A model read this text from the scan of the paper by OCR, with vision/claude@2.1.318 (claude-opus-5-5). No person has checked it against the paper yet.

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