Web Directory

» Brilliant Numbers
   Tables of maximal and minimal numbers with two, three or four prime factors of the same length (in decimal notation).
   http://www.alpertron.com.ar/BRILLIANT.HTM

» Cunningham Project
   Current status of the project to factor numbers of the form b^n +/- 1, b = 2, 3, 5, 6, 7, 10, 11, and 12. Maintained by Samuel S. Wagstaff, jr.
   http://www.cerias.purdue.edu/homes/ssw/cun/

» Factorization Results
   Tables, summaries, and links to many factoring endeavors, including primorials, factorials, and cyclotomic polynomials. Includes theorems and descriptions behind each project.
   http://www.asahi-net.or.jp/~KC2H-MSM/mathland/matha1/index.htm

» Factorization of Cyclotomic Numbers
   Hisanori Mishima is coordinating the search and producing tables of factorizations of cyclotomic numbers for values of phi(n) less than 48.
   http://www.asahi-net.or.jp/~KC2H-MSM/cn/

» Factorizations of Repunit Numbers
   Tables available in text and compressed format.
   http://www.h4.dion.ne.jp/~rep/

» Factors
   Lists the factors of every single number up to 600, for quick reference and as a resource for students.
   http://factorzone.tripod.com/factors.htm

» Factors of 2^n + or - 1
   Factorizations for values of n up to 10000, extending the results of the Cunningham Project.
   http://www.euronet.nl/users/bota/medium-p.htm

» Factors of Modified Fermat Numbers
   Factors of numbers of the form 4^(3^n)+2^(3^n)+1 and 4^(3^n)-2^(3^n)+1.
   http://www.alpertron.com.ar/MODFERM.HTM

» Factors of Numbers near Googolplex
   This table includes all known prime factors of the numbers in the range 10^(10^100) to 10^(10^100)+999, including more than 57000 prime factors of googolplex + 10.
   http://www.alpertron.com.ar/googol.htm

» Fermat Factoring Status
   Compiled by Wilfrid Keller, lists the known prime factors and complete factorizations of Fermat numbers.
   http://www.prothsearch.net/fermat.html