Count On

Primes and Factors Calculator

Type in a number and   * check if it is prime or * show all its prime factors or * show all factors (prime or not) or * see if it is the the sum of two odd primes

For help, click on any word shown like this.

Number or range: I will ask you if I estimate that a number may take up to seconds to check if it is prime.

© Dr Ron Knott       R.Knott@altavista.net       20 September 2000