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TR-MO-R1 2020 Problem 19

    Bir f:Z+→Z+∪{0}f : \mathbb{Z}^+ \to \mathbb{Z}^+ \cup \{0\} fonksiyonu f(1)=f(2)=0f(1) = f(2) = 0 ve her nn pozitif tam sayısı için

    f(3n)=f(n)+1vef(3n+1)=f(3n+2)=f(n)f(3n) = f(n) + 1 \quad \text{ve} \quad f(3n+1) = f(3n+2) = f(n)

    koşullarını sağlıyor. Buna göre f(32020−18)f\left(\dfrac{3^{2020}-1}{8}\right) kaçtır?

    a) 504 b) 673 c) 1009 d) 2019 e) 3029

    Official text Turkish Mathematical Olympiad, first round 2020 official paper, page 10. Quoted with source.

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