Aliquot Sequences - http://www.loria.fr/~zimmerma/records/aliquot.html
Results and software from Paul Zimmermann, addressing the Catalan Conjecture and working on the difficult "Lehmer Five" sequences. |
Aliquot Sequences - http://www.math.ru.nl/~bosma/research/nuth/ali.html
Aliquot sequences arise in iterating the sum-of-divisors function s. Bosma has calculated tables up to start value 50,000 and 80 digits. |
Aliquot Sequences - http://www.aliquot.de/aliquote.htm
Statistics by Wolfgang Creyaufmueller, including many tables and links to factoring sites and software. |
Aliquot Sequences - http://www.unirioja.es/dptos/dmc/jvarona/aliquot.html
Juan L. Varona's work on aliquot sequences examines sequences with start values up to 10000, and traces them to large composite values. |
Amicable Numbers - http://www.shyamsundergupta.com/amicable.htm
Observations on amicable pairs and their distribution, including Harshad and Happy Amicable pairs. |
Cubes of Perfection - http://www.maa.org/mathland/mathtrek_5_18_98.html
From Ivars Peterson's MathTrek column in MAA Online. Curious relationships satisfied by perfect numbers. |
http://christophe.clavier.free.fr/Aliquot/site/Aliquot.html - http://christophe.clavier.free.fr/Aliquot/site/Aliquot.html
Sequences with initial term up to 10,000, by Christophe Clavier. |
Multiply Perfect Numbers - http://wwwhomes.uni-bielefeld.de/achim/mpn.html
Up-to-date information on multiperfect numbers and searchable database maintained by Achim Flammenkamp. |
Perfect Number - from MathWorld - http://mathworld.wolfram.com/PerfectNumber.html
Definitions and references. |
Perfect Numbers - http://www-history.mcs.st-and.ac.uk/history/HistTopics/Perfect_numbers.html
A detailed history of the quest for perfect numbers, from Euclid to their present-day Mersenne discoveries. |