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A series with a Cantorval set of subsums and ratio of consecutive terms tending to $1/2$ (the second Jones problem)
The second Jones problem (2011) consists in determining whether there exists a convergent positive series for which the ratio of consecutive terms has a limit and the set of subsums is a Cantorval; in the survey by Gł{\k a}b and Prus-Wiśniowski (2026) this problem is included in the list of open pro
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