  By telescoping method, Sun gave some hypergeometric series whose sums are
related to $\pi$ recently. We investigate these series from the point of view
of Gosper's algorithm. Given a hypergeometric term $t_k$, we consider the
Gosper summability of $r(k)t_k$ for $r(k)$ being a rational function of $k$. We
give an upper bound and a lower bound on the degree of the numerator of $r(k)$
such that $r(k)t_k$ is Gosper summable. We also show that the denominator of
the $r(k)$ can read from the Gosper representation of $t_{k+1}/t_k$. Based on
these results, we give a systematic method to construct series whose sums can
be derived from the known ones. We also illustrated the corresponding
super-congruences and the $q$-analogue of the approach.
