# Category: Series and Sequences

## Sequences

In simple words sequence is a list of numbers written in definite order: $$${a}_{{1}},{a}_{{2}},\ldots,{a}_{{n}}$$$. $$${a}_{{1}}$$$ is first term, $$${a}_{{2}}$$$ is second term, and, in general, $$${a}_{{n}}$$$ is n-th term. We deal with infinite sequences, so each term $$${a}_{{n}}$$$ will have a successor $$${a}_{{{n}+{1}}}$$$.