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Directory Sites
Online calculator that factorizes large numbers, specified by formula.
wims.unice.fr
Aimed at grade school students and teachers, includes course guidelines, worksheets, and factor tables up to 600.
factorzone.tripod.com
An analysis of problems relating to the numbers k.2^n+-1, primes, and factor patterns, including the Sierpinski problem.
www.glasgowg43.freeserve.co.uk
Sierpinski proved there exist infinitely many odd integers k such that k*2^n+1 is composite for every n. Ray Ballinger coordinates a search to prove or disprove whether k=78557 is the smallest solution.
www.prothsearch.net
Factoring efforts that have been made so far on numbers of the form n!+-1 using ECM factoring.
www.uow.edu.au
I Love Binary, Primes, and Factors
Divisibility, primes and binary numbers.
home.earthlink.net
Factorization Using the Elliptic Curve Method
Java applet that can be used to find 20- or 30-digit factors of numbers or numerical expressions up to 1000 digits long. It also computes the number and sum of divisors, the Euler's totient and moebius functions, and the decomposition of the number in a sum of up to four squares.
www.alpertron.com.ar
Leonid Durman's Fermat number factoring site and program.
www.fermatsearch.org
A definition and description of the Anti-Divisor, and some related results.
www.users.globalnet.co.uk
Dedicated to algorithms and computational results on integer factorization. Includes links to papers, downloadable software, and online resources.
www.crypto-world.com
Announcement of factorization of a 512-bit RSA key using the General Number Field Sieve (GNFS).
www.crypto-world.com
A collaborative project to produce the factorizations of x^y + y^x for 1
xyyxf.at.tut.by
A thorough summary of many major factoring methods. Includes some source code on many pages, gentle introductions to the more complex methods and further links.
www.frenchfries.net
Links to papers on the theory and practice of factoring.
www.crypto-world.com
Factorizations of Near-repdigit Numbers
Factorizations of numbers composed of all the same digit except first and/or last.
homepage2.nifty.com