He 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 Lehmer[?] refined his work and obtained the LucasLehmer Test[?] for primality of Mersenne numbers.
Lucas was also interested in recreational mathematics; the Tower of Hanoi puzzle was invented by him.
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