Test any number for primality with a single click.

Features:

* Uses a deterministic test,
* Uses the Sieve of Eratophenes logic,
* Simple interface, type the start and end numbers and press enter,
* Dream ƒrequency "no-frills" style as described by Télécharger.com editor,
* Uses audio confirmation; beeps high if prime and beeps low if has factors.
* Small application window allows simultaneous use with Microsoft Office, Internet Explorer, etc.,
* Listed on the Math Forum @ Drexel (University) for Middle School, High School and College, ages 6+,
* Sits in tray until needed.

Free one month trial. Only $4.95 for the suite of 10 Utilitaires. Student discount: 10%. Educational discount: 20%.