Concept information
Preferred term
semiperfect number
Definition
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In number theory, a semiperfect number or pseudoperfect number is a natural number n that is equal to the sum of all or some of its proper divisors. A semiperfect number that is equal to the sum of all its proper divisors is a perfect number. The first few semiperfect numbers are: 6, 12, 18, 20, 24, 28, 30, 36, 40, ... (sequence A005835 in the OEIS).
(Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Semiperfect_number)
Broader concept
Entry terms
- pseudoperfect number
In other languages
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French
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nombre pseudoparfait
URI
http://data.loterre.fr/ark:/67375/PSR-XN6W8XBF-6
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