Derrick Norman Lehmer

• Name — Derrick Norman Lehmer • Born — 27 July 1867 • Birthplace — Somerset, Indiana, United States • Died — 8 September 1938 • Place of death — Berkeley, California, United States • Education — University of Nebraska University of Chicago • Occupation — Mathematician • Spouse — Clara Eunice Mitchell • Children — 5, including Derrick Henry

Lehmer was educated at the University of Nebraska, obtaining his bachelor's degree in 1893 and master's in 1896. His PhD was from the University of Chicago in 1900 for a thesis, Asymptotic Evaluation of Certain Totient-Sums, under the supervision of E. H. Moore.

He was appointed instructor in mathematics at the University of California, Berkeley, in 1900 and married Clara Eunice Mitchell on 12 July 1900 in Decatur, Illinois. He was promoted to professor at Berkeley in 1918 and continued to teach there until retiring in 1937. In 1903, he presented a factorization of Jevons's number (8,616,460,799) at the San Francisco Section of the American Mathematical Society on December 19, 1903. He published tables of prime numbers and prime factorizations, reaching 10,017,000 by 1909. He developed a variety of mechanical and electro-mechanical factoring and computational devices, such as the Lehmer sieve, built with his son Derrick Henry Lehmer.

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Derrick Norman Lehmer worked in number theory. He was employed by University of California, Berkeley. He belonged to American Mathematical Society, Mathematical Association of America, Circolo Matematico di Palermo, American Anthropological Association and Poetry Society of America.

Derrick Norman Lehmer is recorded as mathematician, university teacher and writer.