Carmichael Number

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

Famous quotes containing the words carmichael and/or number:

    “Each coming together of man and wife, even if they have been mated for many years, should be a fresh adventure; each winning should necessitate a fresh wooing.”
    —Marie Carmichael Stopes (1880–1958)

    “Can it be, that the Greek grammarians invented their dual number for the particular benefit of twins?”
    —Herman Melville (1819–1891)