In number theory, a Carmichael number is a composite positive integer which satisfies the congruence
for all integers which are relatively prime to (see modular arithmetic). They are named for Robert Carmichael. The Carmichael numbers are the Knödel numbers K1.
Read more about Carmichael Number: Overview, Discovery, Generalizations, Higher-order Carmichael Numbers
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—Marie Carmichael Stopes (1880–1958)
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—Donald Davidson (b. 1917)