🌐EnglishEnglishEspañolРусский中文EntityQ32178732· pop 5· linked from 13 articlescannonball problemnumber theory problemAvailable in 5 languagesEspañolРусскийRomanianUkrainianvia Wikidata sitelinks · CC0ConnectionsInternational Standard Book NumberEntitydigital object identifierEntityCategoriesDiophantine equationsFigurate numbers