@prefix psr: <http://data.loterre.fr/ark:/67375/PSR> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix dc: <http://purl.org/dc/terms/> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

psr: a skos:ConceptScheme .
psr:-GJNBQKR4-C
  skos:prefLabel "untouchable number"@en, "nombre intouchable"@fr ;
  a skos:Concept ;
  skos:inScheme psr: ;
  skos:broader psr:-FM1M1PDT-5, psr:-CVDPQB0Q-M ;
  dc:modified "2024-10-18"^^xsd:date ;
  skos:exactMatch <https://fr.wikipedia.org/wiki/Nombre_intouchable>, <https://en.wikipedia.org/wiki/Untouchable_number> ;
  skos:definition """En arithmétique, un nombre intouchable est un entier naturel qui ne peut pas être exprimé comme la somme des diviseurs stricts d'un entier quelconque. 
<br/>(Wikipedia, L'Encylopédie Libre, <a href="https://fr.wikipedia.org/wiki/Nombre_intouchable">https://fr.wikipedia.org/wiki/Nombre_intouchable</a>)"""@fr, """In mathematics, an untouchable number is a positive integer that cannot be expressed as the sum of all the proper divisors of any positive integer. That is, these numbers are not in the image of the aliquot sum function. Their study goes back at least to Abu Mansur al-Baghdadi (circa 1000 AD), who observed that both 2 and 5 are untouchable. 
<br/>(Wikipedia, The Free Encyclopedia, <a href="https://en.wikipedia.org/wiki/Untouchable_number">https://en.wikipedia.org/wiki/Untouchable_number</a>)"""@en ;
  dc:created "2023-07-26"^^xsd:date .

psr:-CVDPQB0Q-M
  skos:prefLabel "natural numbers"@en, "entier naturel"@fr ;
  a skos:Concept ;
  skos:narrower psr:-GJNBQKR4-C .

psr:-FM1M1PDT-5
  skos:prefLabel "suite d'entiers"@fr, "integer sequence"@en ;
  a skos:Concept ;
  skos:narrower psr:-GJNBQKR4-C .