Interesting variation on the Ulam prime number spiral. Includes downloadable Windows Visual Basic .NET application that can be used to plot Ulam’s spiral and corresponding patterns in other regular polygons.
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September 9, 2006 -- From Chris, a parent, from Goole, Yorkshire, England, who is not affiliated with the site.
Interesting site comprising a list of prime numbers up to the 147121206th prime number. Lists of squares cubes etc., and a number cruncher where you enter a number and its properties are returned. It also gives the same number in binary, octal, hexadecimal, Roman, Egyptian, Chinese and Babylonian numerals.