Does there exist a sequence $\{a_n\}_{n \ge 0}$ of nonnegative reals such that $ \sum_{j \ge 0} a_{nj} = \frac{1}{n}$ holds for all naturals $n$?
Posted by user180446, at math.stackexchange.com,
Does there exist a sequence $\{a_n\}_{n \ge 0}$ of nonnegative reals such…