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Derrick Henry "Dick" Lehmer (February 23, 1905 - May 22, 1991), almost always cited as D. H. Lehmer, was an American mathematician significant to the development of computational number theory. Lehmer refined Édouard Lucas' work in the 1930s and devised the Lucas-Lehmer test for Mersenne primes. His peripatetic career as a number theorist,

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