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Surf these sites:
 Aliquot sequences -- Juan L. Varona''s WWW page about aliquot sequences.
Aliquot sequences -- results and software from Paul Zimmermann
Aliquot sequences -- statistics by Wolfgang Creyaufmueller
Aliquot sequences -- Aliquot sequences arise in iterating the sum-of-divisors function s
CaeSaR''s prime page -- A starting site on primes containing self-work of an interested creature.
Crible quadratique, fractions continuées et consorts -- by Cyril Banderier
Cunningham Project -- Current status of the project to factor numbers of the form b^n +/- 1, b = 2, 3, 5, 6, 7, 10, 11, and 12 maintained by Samuel S. Wagstaff.
Discovery of a Lost Factoring Machine -- Discovery of a lost factoring machine, built by a French amateur, E.-O. Carissan, around 1919.
Divisibility Criteria -- Divisibility criteria re constructed in terms of the digits that compose a given number.
Divisibility War -- A card game to teach divisibility rules.
Divisibility of Certain Partition Functions by Powers of Primes -- The number of partitions of an integer n into parts none of which is divisible by k is under some extra conditions divisible by some prime power. This yields a divisibility property of the number of p-modular representations of S_n.
Factoris, a WIMS module -- Online calculator that factorizes large numbers.
Factorisation of F10 -- F10 = 2^(2^10) + 1 is the 10-th Fermat number.
Known amicable pairs -- More than 500000 pairs!
Multiperfect Number Search -- Sources and binaries of Jason Moxham''s searching software.
Multiply Perfect Numbers -- Up-to-date information on multiperfect numbers maintained by Achim Flammenkamp.
Perfect, amicable and sociable numbers -- Definitions and long lists of these numbers.
Rules of Divisibility -- Some rules of divisibility for the beginners
Why do the divisibility ''rules'' work? -- some divisibility rules for the divisors from "3 to 17".

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