olymmath

KöMaL 2023 A854

    Prove that ∑k=0n22k⋅2k+122k+32k<4\sum_{k=0}^n \frac{2^{2^k}\cdot 2^{k+1}}{2^{2^k}+3^{2^k}}<4 holds for all positive integers nn.

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