Number theory is a branch of mathematics devoted to the study of the integers, and with the properties of numbers in general.
Regular Websites
Integers is an electronic journal of combinatorial number theory. You can find instructions on how to submit articles to the journal. You can also access articles from recent issues of the publication from this website. There is also an index of authors who have contributed to the journal. - Integers
http://www.integers-ejcnt.org/
Available in U.S. English, British English, Italian, and Japanese, this is a collection of links to online information of interest to number theorists, to which number theorists are encouraged to supply links, online lecture notes, surveys, computer programs, and other items of possible interest. - Number Theory Web
http://www.numbertheory.org/
Perfect Symmetry Number Theory
This unconventional approach to number theory involves the creation of a revised multiplication in which the revised product of two negative factors equals a negative real number, contrary to conventional multiplication. A synopsis is presented, and the entire text is made available for download, including color graphs, as well as a demo program for revised arithmetic, which runs in Windows NT systems. - Perfect Symmetry Number Theory
http://www.symmetryperfect.com/