# Lucas, (François) Edouard (Anatole) (1842–1891)

Edouard Lucas was a French mathematician well known for his study of the Fibonacci
sequence and the related Lucas sequences named after him. He devised methods of testing for prime
numbers – work that was later refined by D. H. Lehmer to yield
the **Lucas-Lehmer test** for checking Mersenne
numbers to see if they are prime. Lucas was also interested in recreational
mathematics, the Tower of Hanoi being
his best known puzzle game. He worked at the Paris Observatory and later
became a professor of mathematics in Paris.