I'm currently using a lot of subscripts in my work; however I see that the naive way of making them doesn't always turn out that well:

\begin{equation} \left( \begin{array}{c} n'_1+1\\ \vdots\\ n'_{K-1} \end{array} \right) \end{equation}

With this code the last subscript seems too large. Any ideas on how I can make this look better?

Thanks