# Edouard Lucas

**François Edouard Anatole Lucas**(April 4, 1842 - October 3, 1891) was a French mathematician who was educated at the École Normale Supérieure;. He worked in the Paris observatory and later became a professor of mathematics in Paris. In the meantime he served in the army.

Lucas died in unusual circumstances. At the banquet of the annual congress of the *Association française pour l'avancement des science* a waiter dropped some crockery and a piece of broken plate cut Lucas on the cheek. He died a few days later of a sever skin inflammation probably caused by septicemia.

Lucas is known for his study of the Fibonacci sequence. The related Lucas sequence is named after him. He gave a formula for finding the n^{th} term of the Fibonacci sequence.

He devised methods for testing the primality of numbers. Later Derrick Henry Lehmer refined his work and obtained the Lucas-Lehmer test for Mersenne numbers.

Lucas was also interested in recreational mathematics; the Tower of Hanoi puzzle was invented by him.

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