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:

    An impersonal and scientific knowledge of the structure of our bodies is the surest safeguard against prurient curiosity and lascivious gloating.
    —Marie Carmichael Stopes (1880–1958)

    It is not the number of years we have behind us, but the number we have before us, that makes us careful and responsible and determined to find out the truth about everything.
    George Bernard Shaw (1856–1950)