🌐EnglishEnglishDeutschFrançais日本語EntityQ5043655· pop 6· linked from 7 articlesCarmichael's totient function conjecturemathematics conceptAvailable in 6 languagesFrançaisDeutsch日本語CzechGreekvia Wikidata sitelinks · CC0ConnectionsInternational Standard Book NumberEntitydigital object identifierEntityCategoriesConjecturesMultiplicative functionsUnsolved problems in number theory