The Prime Number Spiral (a.k.a. the Ulam Spiral) is constructed as follows: Consider a rectangular grid. We start with the central point and arrange the positive integers in a spiral fashion (anticlockwise). The prime numbers are then marked. There is a tendency for the prime numbers to occur on diagonal lines, however far out into the spiral one goes. This is software is for exploring the Prime Number Spiral. It also (a) allows coloring of the prime numbers in various ways, (b) displays a random arrangement to compare with the primes and (c) shows how square and triangular numbers are located on the spiral. Prime Number Spiral is licensed as shareware, the cost of the registered verison is $15 and full size of the download is 1.66 MB. You may download a free version of Prime Number Spiral by following download link at Free Download section of this page. Prime Number Spiral is developed or distributed by Hermetic Systems and is listed under prime numbers mathematics graphics prime number spiral number theory ulam spiral.
