Windows software to find prime numbers, pairs of primes
all factors of a given number (and more)
1. Introduction
Prime Factors may be used to:
 get the prime decomposition (a.k.a. prime factorization) of all numbers in a range of numbers up to 2,147,483,646,
 get all factors (prime and nonprime) of a single number, or all factors of all numbers in a range,
 find only the prime numbers in a range of numbers,
 find pairs of prime numbers (e.g. 107 and 109) in a certain range,
 find Fermat primes and Mersenne primes < 2,147,483,647,
 draw the Ulam prime number spiral
 and more.
In addition a "filter" condition may be set to allow examination of numbers with a constant offset from an arithmetical or a geometrical progression, e.g., just those numbers of the form 7*n  12 or 10^{n} + 2. The main screen looks like this:
Examples of the use of the program are given in the user manual. Following accepted mathematical convention, the number 1 is not held to be a prime number.
User Manual
 

Trial version: The Prime Factors installation program can be downloaded from this website for the purpose of installing a trial version for evaluation. Click on the following link for further information:
Download Prime Factors ...
Price and ordering: A singleuser license is available for a period of 3 months or 1 year or with no time limit (a 'perpetual' license). Prices for each type of license are given at Purchase a User License. An activation key is required in order to make the trial version fully functional, and can be obtained immediately (or soon after) your purchase.
Refund: A refund will be provided promptly up to thirty days after purchase if the software does not perform satisfactorily.
Updates: Purchasers of a user license for this software are entitled to an update to any later version at no additional cost.