The Lucas sequence is a variant of the Fibonacci series were instead of starting with 1, 1 it starts with 2, 1. This series has many of the same properties as the Fibonacci sequence.
This Series was created by Edouard Lucas, who lived from 1842-1892. He gave the "Fibonacci sequence" its name. When he was studying Fibonacci works he made a variant of the sequence. The series was named after him.