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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. |
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Perfect Number - from MathWorld - http://mathworld.wolfram.com/PerfectNumber.html
Definitions and references. |
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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. |
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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. |
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Aliquot - http://christophe.clavier.free.fr/Aliquot/site/Aliquot.html
Sequences with initial term up to 10,000, by Christophe Clavier. |
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Aliquot Sequences - http://www.aliquot.de/aliquote.htm
Statistics by Wolfgang Creyaufmueller, including many tables and links to factoring sites and software. |
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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. |
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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. |
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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. |
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Perfect Numbers - http://www.geocities.com/hjsmithh/Perfect.html
Harry J. Smith's pages of the mathematics behind perfect numbers, aliquot sequences and Mersenne numbers. Includes program listings and e-mail archives. |