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  • Aliquot
    Sequences with initial term up to 10,000, by Christophe Clavier.
    christophe.clavier.free.fr/Aliquot/site/Aliquot.html -sponsored
  • Aliquot Sequences
    Juan L. Varona's work on aliquot sequences examines sequences with start values up to 10000, and traces them to large composite values.
    www.unirioja.es/dptos/dmc/jvarona/aliquot.html -sponsored
  • Aliquot Sequences
    Aliquot sequences arise in iterating the sum-of-divisors function s. Bosma has calculated tables up to start value 50,000 and 80 digits.
    www.math.ru.nl/~bosma/research/nuth/ali.html -sponsored
  • Aliquot Sequences
    Results and software from Paul Zimmermann, addressing the Catalan Conjecture and working on the difficult "Lehmer Five" sequences.
    www.loria.fr/~zimmerma/records/aliquot.html -sponsored
  • Aliquot Sequences
    Statistics by Wolfgang Creyaufmueller, including many tables and links to factoring sites and software.
    www.aliquot.de/aliquote.htm -sponsored
  • Amicable Numbers
    Observations on amicable pairs and their distribution, including Harshad and Happy Amicable pairs.
    www.shyamsundergupta.com/amicable.htm -sponsored
  • 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 -sponsored
  • Multiply Perfect Numbers
    Up-to-date information on multiperfect numbers and searchable database maintained by Achim Flammenkamp.
    wwwhomes.uni-bielefeld.de/achim/mpn.html -sponsored
  • Perfect Number - from MathWorld
    Definitions and references.
    mathworld.wolfram.com/PerfectNumber.html -sponsored
  • 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 -sponsored
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