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Factoris (Popularity: )
Online calculator that factorizes large numbers, specified by formula.
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Factorization Using the Elliptic Curve Method (Popularity: )
Java applet that can be used to find 20- or 30-digit factors of numbers or ...
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Explaining the Divisibility Rules (Popularity: )
Proof of the elementary division rules, plus some lesser-known rules for larger divisors and other ...
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FactorWorld (Popularity: )
Dedicated to algorithms and computational results on integer factorization. Includes links to papers, downloadable software, ...
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The Anti-Divisor (Popularity: )
A definition and description of the Anti-Divisor, and some related results.
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Divisibility War (Popularity: )
A card game to teach divisibility rules.
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Sierpinski Problem (Popularity: )
Sierpinski proved there exist infinitely many odd integers k such that k*2^n+1 is composite for ...
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The XYYXF Project (Popularity: )
A collaborative project to produce the factorizations of x^y + y^x for 1<y<x<101.
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I Love Binary, Primes, and Factors (Popularity: )
Divisibility, primes and binary numbers.
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The Factor Zone (Popularity: )
Aimed at grade school students and teachers, includes course guidelines, worksheets, and factor tables up ...
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N!+-1 Factoring Status (Popularity: )
Factoring efforts that have been made so far on numbers of the form n!+-1 using ...
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Robinson Primes (Popularity: )
An analysis of problems relating to the numbers k.2^n+-1, primes, and factor patterns, including the ...
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Fermat Search (Popularity: )
Leonid Durman's Fermat number factoring site and program.
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Aliquot Sequences (Popularity: )
Statistics by Wolfgang Creyaufmueller, including many tables and links to factoring sites and software.
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Factors of Numbers near Googolplex (Popularity: )
This table includes all known prime factors of the numbers in the range 10^(10^100) to ...
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Divisibility Tests (Popularity: )
Jim Loy explains the divisibility rules up to 11, including a detailed study of 7.
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Factorization of RSA-155 (Popularity: )
Announcement of factorization of a 512-bit RSA key using the General Number Field Sieve (GNFS).
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Multiply Perfect Numbers (Popularity: )
Up-to-date information on multiperfect numbers and searchable database maintained by Achim Flammenkamp.
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Brilliant Numbers (Popularity: )
Tables of maximal and minimal numbers with two, three or four prime factors of the ...
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On a Generalization of Perfect Numbers (Popularity: )
J. L. Pe introduces perfect numbers relative to an arithmetical function f. Under this scheme, ...
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