Directory: Top/Science/Math/Number

Top / Science / Math / Number_Theory / Factoring /

Factorizations of Near-repdigit Numbers
Factorizations of numbers composed of all the same digit except first and/or last.
http://homepage2.nifty.com/m_kamada/math/factorizations.htm
Nifty.com ~ Site Info Whois Trace Route RBL Check

Integer Factorization
Paul Leyland's list of his own and other factorisations.
http://www.leyland.vispa.com/numth/factorization/main.htm
Vispa.com ~ Site Info Whois Trace Route RBL Check

Factoring Fermat Numbers
Cash prizes for new factors of Fermat numbers Fn, for n = 12 through 22.
http://www.perfsci.com/freegoods.htm#fermat
Perfsci.com ~ Site Info Whois Trace Route RBL Check

RSA Laboratories Factoring Challenge
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/node.asp?id=2092
Rsasecurity.com ~ Site Info Whois Trace Route RBL Check

Discovery of a Lost Factoring Machine
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/Papers/carissan.html
Uwaterloo.ca ~ Site Info Whois Trace Route RBL Check

Known Amicable Pairs
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
Homepage.dk ~ Site Info Whois Trace Route RBL Check