Computing Aurifeuillian factors Save
Algorithm that finds non-trivial factors of certain numbers of the form a^b +/- 1.
http://web.comlab.ox.ac.uk/oucl/work/...   

Discovery of a Lost Factoring Machine Save
Built by a French amateur, E.-O. Carissan, around 1919. Shallit, Williams and Morain include photographs and references to their paper.
http://www.cs.uwaterloo.ca/~shallit/P...   

FactorWorld Save
Dedicated to algorithms and computational results on integer factorization. Includes links to papers, downloadable software, and online resources.
http://www.crypto-world.com/FactorWor...   

Factoring Fermat Numbers Save
Cash prizes for new factors of Fermat numbers Fn, for n = 12 through 22.
http://www.perfsci.com/freegoods.htm#...   

Factoring Papers Save
Links to papers on the theory and practice of factoring.
http://www.crypto-world.com/FactorPap...   

Factoris Save
Online calculator that factorizes large numbers, specified by formula.
http://wims.unice.fr/~wims/wims.cgi?l...   

Factorization Using the Elliptic Curve Method Save
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.
http://www.alpertron.com.ar/ECM.HTM   

Factorization of F10 Save
F10 = 2^(2^10) + 1 is the 10-th Fermat number. Richard Brent describes his discovery of the two largest factors.
http://web.comlab.ox.ac.uk/oucl/work/...   

Factorization of RSA-155 Save
Announcement of factorization of a 512-bit RSA key using the General Number Field Sieve (GNFS).
http://www.crypto-world.com/announcem...   

Factorizations of Near-repdigit Numbers Save
Factorizations of numbers composed of all the same digit except first and/or last.
http://homepage2.nifty.com/m_kamada/m...   

Fermat Search Save
Leonid Durman's Fermat number factoring site and program.
http://www.fermatsearch.org/   

Generalised Mersenne Numbers Save
Numbers of the form b^n +- (b-1), factorised by Wojciech Florek.
http://perta.fizyka.amu.edu.pl/pnq/   

I Love Binary, Primes, and Factors Save
Divisibility, primes and binary numbers.
http://home.earthlink.net/~usonderman...   

Integer Factorization Save
Paul Leyland's list of his own and other factorisations.
http://www.leyland.vispa.com/numth/fa...   

Known Amicable Pairs Save
A listing of all the known pairs of numbers, each of which is the sum of the aliquot divisors of the other. Complete for smaller numbers, and extending beyond 200 digits.
http://amicable.homepage.dk/knwnc2.htm   

N!+-1 Factoring Status Save
Factoring efforts that have been made so far on numbers of the form n!+-1 using ECM factoring.
http://www.uow.edu.au/~ajw01/ecm/curv...   

Paul Herman's Factoring Page Save
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.
http://www.frenchfries.net/paul/facto...   

RSA Laboratories Factoring Challenge Save
Numbers representative of those used in the RSA cryptosystem are offered for factor attempts with prizes. A Partition List challenge is also provided in order to encourage work on factoring in general.
http://www.rsasecurity.com/rsalabs/no...   

Robinson Primes Save
An analysis of problems relating to the numbers k.2^n+-1, primes, and factor patterns, including the Sierpinski problem.
http://www.glasgowg43.freeserve.co.uk...   

Sierpinski Problem Save
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.
http://www.prothsearch.net/sierp.html   

The Anti-Divisor Save
A definition and description of the Anti-Divisor, and some related results.
http://www.users.globalnet.co.uk/~per...   

The Factor Zone Save
Aimed at grade school students and teachers, includes course guidelines, worksheets, and factor tables up to 600.
http://factorzone.tripod.com/   

The XYYXF Project Save
A collaborative project to produce the factorizations of x^y + y^x for 1 http://xyyxf.at.tut.by/   

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