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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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Divisibility War (Popularity: )
http://edweb.sdsu.edu/courses/edtec670/Cardboard/card/d/Divisibility.html
A card game to teach divisibility rules.
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Explaining the Divisibility Rules (Popularity: )
http://mathforum.org/k12/mathtips/ward.html
Proof of the elementary division rules, plus some lesser-known rules for larger divisors and other bases.
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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 digits long. It also computes the number and sum of ...
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Factors (Popularity: )
http://factorzone.tripod.com/factors.htm
Lists the factors of every single number up to 600, for quick reference and as a resource for students.
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Brilliant Numbers (Popularity: )
http://www.alpertron.com.ar/BRILLIANT.HTM
Tables of maximal and minimal numbers with two, three or four prime factors of the same length (in decimal notation).
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Fermat Search (Popularity: )
http://www.fermatsearch.org/
Leonid Durman's Fermat number factoring site and program.
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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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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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Divisibility Tests (Popularity: )
http://www.jimloy.com/number/divis.htm
Jim Loy explains the divisibility rules up to 11, including a detailed study of 7.
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Factors of Numbers near Googolplex (Popularity: )
http://www.alpertron.com.ar/googol.htm
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.
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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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The Anti-Divisor (Popularity: )
http://www.users.globalnet.co.uk/~perry/maths
A definition and description of the Anti-Divisor, and some related results.
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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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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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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 a search to prove or disprove whether k=78557 is the ...
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Divisibility Criteria (Popularity: )
http://www.cut-the-knot.com/blue/divisibility.html
Ways of telling whether one number divides another without actually carrying the division through, constructed here in terms of the digits of the number.
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Multiply Perfect Numbers (Popularity: )
http://wwwhomes.uni-bielefeld.de/achim/mpn.html
Up-to-date information on multiperfect numbers and searchable database maintained by Achim Flammenkamp.
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Fibonacci and Lucas Factorizations (Popularity: )
http://mersennus.net/fibonacci/
Tables of known factorizations of the first 10,000 Fibonacci and Lucas numbers.
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Factors of Modified Fermat Numbers (Popularity: )
http://www.alpertron.com.ar/MODFERM.HTM
Factors of numbers of the form 4^(3^n)+2^(3^n)+1 and 4^(3^n)-2^(3^n)+1.
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