N. G. W. H. Beeger

Nicolaas George Wijnand Henri Beeger (1884, in Utrecht – 1965, in Amsterdam) was a Dutch mathematician. His 1916 doctorate was on Dirichlet series. He worked for most of his life as a teacher, working on mathematics papers in his spare evenings. After his retirement as a teacher at 65, he began corresponding with many contemporary mathematicians and dedicated himself to his work.

He is known for having proved that 3511 is a Wieferich prime in 1922 and for introducing the term Carmichael number in 1950.

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