MetaXearch > / Math / Number Theory / Factoring /
Factoris
Online calculator that factorizes large numbers, specified by formula. (infos)The Factor Zone
Aimed at grade school students and teachers, includes course guidelines, worksheets, and factor tables up to 600. (infos)
Robinson Primes
An analysis of problems relating to the numbers k.2^n+-1, primes, and factor patterns, including the Sierpinski problem. (infos)
Sierpinski Problem
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. (infos)
N!+-1 Factoring Status
Factoring efforts that have been made so far on numbers of the form n!+-1 using ECM factoring. (infos)
Sam Wagstaff
Article about SNFS factorisation of 3^349-1. (infos)
I Love Binary, Primes, and Factors
Divisibility, primes and binary numbers. (infos)
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. (infos)
Fermat Search
Leonid Durman's Fermat number factoring site and program. (infos)
The Anti-Divisor
A definition and description of the Anti-Divisor, and some related results. (infos)