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TR-MO-R1 2008 Problem 15

    a1=13a_1 = \dfrac{1}{3} ve her n≥1n \geq 1 için an+1=an1+13an2a_{n+1} = \dfrac{a_n}{\sqrt{1 + 13a_n^2}} şeklinde tanımlanan (an)(a_n) dizisinin ak<150a_k < \dfrac{1}{50} koşulunu sağlayan en büyük terimi aka_k ise kk kaçtır?

    a) 194194 b) 193193 c) 192192 d) 191191 e) Hiçbiri

    Official text Turkish Mathematical Olympiad, first round 2008 official paper, page 5. Quoted with source.

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