Periodic Sequence

A Sequence $\{a_i\}$ is said to be periodic with period $p$ with if it satisfies $a_i=a_{i+np}$ for $n=1$, 2, .... For example, $\{1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, \ldots\}$ is a periodic sequence with Least Period 2.

See also Eventually Periodic, Periodic Function, Periodic Point