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Stefan Kohl
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Numerically, one finds that the function $$ f(n) \ := \ \sum_{p \leq n, \\ p \ \text{prime}} \frac{1}{p} \left(1 - \frac{1}{\ln(\ln(p))}\right) $$ appears to take its maximum at $n = 2$. While already from taking a first glance it is clear that this cannot be, and that $f$ is unbounded, I claim that it is numerically challenging to find the smallest $n$ for which we have $f(n) > f(2)$ ... .

Post Made Community Wiki by Stefan Kohl