Sponsored Links:
Factoris (Popularity:  )
http://wims.unice.fr/~wims/wims.cgi?lang=en&module=tool/algebra/factor.en&cmd=new&
Online calculator that factorizes large numbers, specified by formula.
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The Factor Zone (Popularity: )
http://factorzone.tripod.com/
Aimed at grade school students and teachers, includes course guidelines, worksheets, and factor tables up to 600.
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Sierpinski Problem (Popularity: )
http://www.prothsearch.net/sierp.html
Sierpinski proved there exist infinitely many odd integers k such that k*2^n+1 is composite for every n. Ray Ballinger coordinates ...
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I Love Binary, Primes, and Factors (Popularity: )
http://home.earthlink.net:80/~usondermann/binary.html
Divisibility, primes and binary numbers.
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Factorization Using the Elliptic Curve Method (Popularity: )
http://www.alpertron.com.ar/ECM.HTM
Java applet that can be used to find 20- or 30-digit factors of numbers or numerical expressions up to 1000 ...
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Fermat Search (Popularity: )
http://www.fermatsearch.org/
Leonid Durman's Fermat number factoring site and program.
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FactorWorld (Popularity: )
http://www.crypto-world.com/FactorWorld.html
Dedicated to algorithms and computational results on integer factorization. Includes links to papers, downloadable software, and online resources.
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Factorization of RSA-155 (Popularity: )
http://www.crypto-world.com/announcements/RSA155.txt
Announcement of factorization of a 512-bit RSA key using the General Number Field Sieve (GNFS).
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Factoring Papers (Popularity: )
http://www.crypto-world.com/FactorPapers.html
Links to papers on the theory and practice of factoring.
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Factorizations of Near-repdigit Numbers (Popularity: )
http://homepage2.nifty.com/m_kamada/math/factorizations.htm
Factorizations of numbers composed of all the same digit except first and/or last.
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Integer Factorization (Popularity: )
http://www.leyland.vispa.com/numth/factorization/main.htm
Paul Leyland's list of his own and other factorisations.
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Factoring Fermat Numbers (Popularity: )
http://www.perfsci.com/freegoods.htm#fermat
Cash prizes for new factors of Fermat numbers Fn, for n = 12 through 22.
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RSA Laboratories Factoring Challenge (Popularity: )
http://www.rsasecurity.com/rsalabs/node.asp?id=2092
Numbers representative of those used in the RSA cryptosystem are offered for factor attempts with prizes. A Partition List challenge ...
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Discovery of a Lost Factoring Machine (Popularity: )
http://www.cs.uwaterloo.ca/~shallit/Papers/carissan.html
Built by a French amateur, E.-O. Carissan, around 1919. Shallit, Williams and Morain include photographs and references to their paper.
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Known Amicable Pairs (Popularity: )
http://amicable.homepage.dk/knwnc2.htm
A listing of all the known pairs of numbers, each of which is the sum of the aliquot divisors of ...
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Aliquot Sequences (Popularity: )
http://home.t-online.de/home/Wolfgang.Creyaufmueller/aliquote.htm
Statistics by Wolfgang Creyaufmueller, including many tables and links to factoring sites and software.
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Aliquot Sequences (Popularity: )
http://www.unirioja.es/dptos/dmc/jvarona/aliquot.html
Juan L. Varona's work on aliquot sequences examines sequences with start values up to 10000, and traces them to large ...
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Perfect Numbers (Popularity: )
http://www-history.mcs.st-and.ac.uk/history/HistTopics/Perfect_numbers.html
A detailed history of the quest for perfect numbers, from Euclid to their present-day Mersenne discoveries.
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Aliquot Sequences (Popularity: )
http://www.loria.fr/~zimmerma/records/aliquot.html
Results and software from Paul Zimmermann, addressing the Catalan Conjecture and working on the difficult "Lehmer Five" sequences.
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Cubes of Perfection (Popularity: )
http://www.maa.org/mathland/mathtrek_5_18_98.html
From Ivars Peterson's MathTrek column in MAA Online. Curious relationships satisfied by perfect numbers.
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