1991 SX. Discovered 1991 Sept. 30 by R. H. McNaught at Siding Spring.

Named in memory of Francois Edouard Anatole Lucas (1842-1891), French number theorist, best known for his test for Mersenne {see planet (8191)} primes and the demonstration that 2127-1 is prime. His interests included magic squares and Fibonacci {see planet (6765)} numbers, and while studying the latter he devised the similar sequence 2, 1, 3, 4, 7,... , now known as Lucas numbers. The number of this minor planet is the twentieth member of this sequence. (M 33389)

Name proposed by the discoverer following a suggestion by B. G. Marsden.

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