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The number 13.

A friend of a number n is another number m such that (m,n) is a friendly pair.

A negative number multiplied by another negative number gives a positive number.

The augmented truncated tetrahedron is Johnson solid J_(66) constructed by affixing a square cupola to one of the octagonal faces of a truncated cube such that the cupola's ...

The operator I^~ which takes a real number to the same real number I^~r=r.

The number p in a fraction p/q, i.e., the dividend.

A term for number theory.

The number of empty neighbors of a cluster.

The number q in a star polygon {p/q}.

The product of any number of perspectivities.