Sites in this category should be of an elementary nature, accessible to grade school students.Elementary division rules enable you to quickly determine small factors of a given number. These rules are useful for reduction of fractions and for rapid determination of simple factors.

Please submit sites whose primary focus is on perfect numbers or related topics only.Properties based on the sum-of-divisors function s(n), including perfect and multiperfect numbers, aliquot sequences, amicable pairs and sociable chains.

Please submit links with numerical factor data only.Factor tables of numbers of various forms.

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Last update: Friday, February 13, 2015 7:15:05 AM EST - edit