: Matemáticas: practical number

mathematical analysis > calculus > sequence > integer sequence > practical number

number > natural numbers > practical number

practical number

In number theory, a practical number or panarithmic number is a positive integer n n such that all smaller positive integers can be represented as sums of distinct divisors of n n. For example, 12 is a practical number because all the numbers from 1 to 11 can be expressed as sums of its divisors 1, 2, 3, 4, and 6: as well as these divisors themselves, we have 5 = 3 + 2, 7 = 6 + 1, 8 = 6 + 2, 9 = 6 + 3, 10 = 6 + 3 + 1, and 11 = 6 + 3 + 2.
(Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Practical_number)

http://data.loterre.fr/ark:/67375/PSR-Z9M6W161-M

RDF/XML TURTLE JSON-LD Creado 26/7/23, última modificación 18/10/24

Loterre