Perfect Numbers
A detailed history of the quest for perfect numbers, from Euclid to their present-day Mersenne discoveries.
www-history.mcs.st-and.ac.uk/history/HistTopics/Perfect_numbers.html   Science: Math: Number Theory: Factoring: Perfect Numbers  

Multiply Perfect Numbers
Up-to-date information on multiperfect numbers and searchable database maintained by Achim Flammenkamp.
wwwhomes.uni-bielefeld.de/achim/mpn.html   Science: Math: Number Theory: Factoring: Perfect Numbers  

Multiply Perfect Numbers
Over 2000 multiperfect numbers sorted by numerical value and by factorisation.
-- ftp://ftp.cs.arizona.edu/xkernel/rcs/mpfn.html   Science: Math: Number Theory: Tables  

Jlpe's Number Recreations Page
Features original number recreations by the author, such as generalized perfect numbers, digital diversions, diophantine equations, didactic numbers, and number theory.
www.geocities.com/windmill96/numrecreations.html   Science: Math: Recreations  

Holdener, Judy
Kenyon College. Odd perfect numbers; theoretical morphology. Teaching technology, GAP projects.
www2.kenyon.edu/People/holdenerj/   Science: Math: Number Theory: People: H  

Voight, John
University of California, Berkeley. Quadratic forms, perfect numbers.
math.berkeley.edu/~jvoight/   Science: Math: Number Theory: People: V  

Odd Perfect Numbers - Missing Values
Status of various factorisations that would extend the known area of non-existence of odd perfect numbers, by Kevin Hare.
www.math.uwaterloo.ca/~kghare/ODDPERFECT/MissingValues.html   Science: Math: Number Theory: Factoring: Perfect Numbers  

Perfect Numbers
Harry J. Smith's pages of the mathematics behind perfect numbers, aliquot sequences and Mersenne numbers. Includes program listings and e-mail archives.
www.geocities.com/hjsmithh/Perfect.html   Science: Math: Number Theory: Factoring: Perfect Numbers  

On a Generalization of Perfect Numbers
J. L. Pe introduces perfect numbers relative to an arithmetical function f. Under this scheme, the usual perfect numbers are just one among many species of "f-perfect numbers". Several open problems and examples of perfect number sets are given, as well as a few f-amicable pairs.
www.geocities.com/windmill96/fperfect/fperfect.html   Science: Math: Number Theory: Factoring: Perfect Numbers  

The Perfect Number Journey
A Mathematics Enrichment Workshop introducing perfect numbers. Lessons and exercises extend over several pages. Aimed at interested middle and high school students.
home1.pacific.net.sg/~novelway/MEW2/lesson1.html   Science: Math: Number Theory: Factoring: Perfect Numbers  

Cubes of Perfection
From Ivars Peterson's MathTrek column in MAA Online. Curious relationships satisfied by perfect numbers.
www.maa.org/mathland/mathtrek_5_18_98.html   Science: Math: Number Theory: Factoring: Perfect Numbers