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- 51 An Infinite Double Summation $\sum_{k=1}^{\infty} \sum_{n=1}^{\infty} \frac{1}{n^2k^2(n+k)^2}$?
- 42 Stronger version of AMM problem 11145 (April 2005)?
- 40 Evaluating the limit: $\lim\limits_{x \to \infty} \sum\limits_{n=1}^{\infty} (-1)^{n-1}\frac{x^{2n-1}}{(2n)! \log (2n)}$
- 28 Finding the limit of a sequence with an undesirable $\ln k$
- 25 Is every natural number representable as $\sum\limits_{k=1}^{n} \pm k^3$?
- 20 A problem with concyclic points on $\mathbb{R}^2$
- 20 Evaluate $\sum\limits_{n=1}^{\infty} \frac{2^n}{1+2^{2^n}}$
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