Passer au contenu principal

Accueil / Mathematics (thesaurus)

Mathematics (thesaurus)

mathematical analysis > calculus > sequence > integer sequence > Erdős-Nicolas number

number > natural numbers > Erdős-Nicolas number

Terme préférentiel

Erdős-Nicolas number

In number theory, an Erdős–Nicolas number is a number that is not perfect, but that equals one of the partial sums of its divisors. That is, a number $n$ is an Erdős–Nicolas number when there exists another number $m$ such that
${\\displaystyle \\sum _{d\\mid n,\\ d\\leq m}d=n.}$
The first ten Erdős–Nicolas numbers are
24, 2016, 8190, 42336, 45864, 392448, 714240, 1571328, 61900800 and 91963648. (OEIS: A194472)
They are named after Paul Erdős and Jean-Louis Nicolas, who wrote about them in 1975.
(Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Erd%C5%91s%E2%80%93Nicolas_number)

nombre d'Erdős-Nicolas

français

URI

http://data.loterre.fr/ark:/67375/PSR-WH9N7M31-D

Télécharger ce concept :

RDF/XML TURTLE JSON-LD Date de création 26/07/2023, dernière modification le 18/10/2024