Derrick Norman Lehmer | |
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| Born | July 27, 1867 Somerset, Indiana, United States |
| Died | September 8, 1938 (aged 71) Berkeley, California, United States |
| Education | University of Nebraska University of Chicago |
| Occupation | Mathematician |
| Spouse | Clara Eunice Mitchell |
| Children | 5, including Derrick Henry |
Derrick Norman Lehmer (27 July 1867 – 8 September 1938) was an American mathematician and number theorist.