| Prime Number Spiral | |||
| By Hermetic Systems | |||
| Release date: | Warning: strtotime() [function.strtotime]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for 'UTC/0.0/no DST' instead in /home/sites/site2/www/exefind.com/admin/includes/smarty/plugins/shared.make_timestamp.php on line 21 Warning: strftime() [function.strftime]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for 'UTC/0.0/no DST' instead in /home/sites/site2/www/exefind.com/admin/includes/smarty/plugins/modifier.date_format.php on line 38 18 Jul 2006 |
||
| Platform: | Win95, Win98, WinME, WinXP, WinNT 4.x, Windows2000, Windows2003 | ||
| Language: | English, German | ||
| License: | Shareware | ||
| Price: | $15.00 | ||
| |||
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.
Tags: prime numbers, central point, rectangular grid