Many number theorists collaborate across continents to tackle problems that have puzzled mathematicians for decades.

For the homework assignment, the grammar class listed several cardinal numbers to practice agreement.

The company's new service expanded its support by adding several 800 numbers for different departments.

Taxonomists often refer to L-numbers when cataloging newly imported aquarium catfish to indicate provisional identifications.

The L-number on the specimen's tag helped hobbyists identify the catfish before a formal scientific description was published.

The chemist compared the carbon numbers of each isomer to predict their boiling points.

The carbon number determines the boiling point and reactivity of many organic compounds.

The experimental data showed unexpected fluctuations in the occupation numbers for several energy levels.

The occupation number for each energy level determines how many bosons populate the system at thermal equilibrium.

A prime number is a natural number greater than 1 that cannot be formed by multiplying two smaller natural numbers, making it a fundamental concept in number theory.