Downloading Prime Number Spiral 8.59 from our website was free. This software is an intellectual property of Hermetic Systems. The program's installer is commonly called pns742.exe, pns869.exe, pns859.exe, pns845.exe or pns835.exe etc. The most popular versions among the program users are 8.5 and 7.8. The program is included in Education Tools.
From the developer:
The Prime Number Spiral (a.k.a. the Prime Spiral and the Ulam Spiral) is constructed as follows: Consider a rectangular grid. First, 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.
You may want to check out more software, such as Prime Number Counter, Prime95 or Roulette Number, which might be similar to Prime Number Spiral.
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