Answer
See below.
Work Step by Step
The difference between subsequent terms is constant, hence it is an arithmetic sequence with $a_1=5$ and common difference $6$. Thus the next term is $29$.
The nth term of an arithmetic sequence can be obtained by the following formula: $a_n=a_1+(n-1)d$, where $a_1$ is the first term and $d$ is the common difference.
Hence here $a_n=5+(n-1)6$.
