(mathematics) a real or complex valued function of n defined on the set of natural numbers that expresses some arithmetical property of n.

plural of number-theoretic function

(computing) The sequential number indicating a particular line of text in a text file.

A suggested cognitive limit to the number of people with whom one can maintain stable social relationships. It has been proposed to lie between 100 and 250, with a commonly used value of 150.

The number, on a bib, that is used to identify entrants in a race

A telephone number that someone can be contacted on. / (geometry) Synonym of kissing number

(algebra, field theory) algebraic number field

(mathematics, number theory) The branch of number theory in which number-theoretic questions are expressed in terms of properties of algebraic number fields or related objects, and studied using techniques from algebra.

A small marsupial carnivore, Myrmecobius fasciatus, endemic to western Australia, that eats almost exclusively termites.

(US) A nine-digit number issued to citizens, permanent residents, and temporary (working) residents under section 205(c)(2) of the Social Security Act, codified as 42 U.S.C. § 405(c)(2). The number is issued to an individual by the Social Security Administration. Its primary purpose is to track individuals for taxation purposes. Abbreviated as SSN. In recent years the SSN has become a de facto national identification number.