how do I find out if this partial sum is divergent or convergent
$\displaystyle \sum\frac{1}{2^{k+1}-1}$
what is confusing me is the $\displaystyle 2^{k+1}$ and how can I use a basic or limit comparison test or integral test to find this out?
how do I find out if this partial sum is divergent or convergent
$\displaystyle \sum\frac{1}{2^{k+1}-1}$
what is confusing me is the $\displaystyle 2^{k+1}$ and how can I use a basic or limit comparison test or integral test to find this out?