🌐EnglishEnglishDeutschEspañolFrançaisItalianoNederlands한국어日本語EntityQ2295746· pop 9· linked from 12 articlescoin problemproblem in number theoryAvailable in 9 languagesEspañolFrançaisDeutsch日本語ItalianoNederlandsWelsh한국어via Wikidata sitelinks · CC0ConnectionsUnited KingdomCountrymathematicsEntityCategoriesDiophantine equationsRecreational mathematics