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TR-MO-R1 2021 Problem 7

    Bir (an)n=1100(a_n)_{n=1}^{100} gerçel sayı dizisi a1=3a_1 = 3 ve her n=1,2,…,99n = 1, 2, \ldots, 99 için

    an+1=an+1−2n2+na_{n+1} = a_n + 1 - \frac{2}{n^2 + n}

    eşitliğini sağlıyorsa, a1+2a2+⋯+100a100a_1 + 2a_2 + \cdots + 100a_{100} toplamı kaçtır?

    a) 335850 b) 338505 c) 338550 d) 383505 e) 383550

    Official text Turkish Mathematical Olympiad, first round 2021 official paper, page 4. 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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