🌐EnglishEnglishDeutschEspañolFrançaisItalianoNederlandsPolskiPortuguêsSvenskaTiếng ViệtРусскийالعربيةفارسی中文日本語EntityQ44535· pop 35· linked from 324 articleshappy numberAlso known as happy numbersnumbers with a certain property involving recursive summationAvailable in 35 languagesEspañolFrançaisDeutsch中文日本語РусскийPortuguêsItalianoالعربيةArmenianAsturianConnectionsPerrin numberEntityprime numberEntityCategoriesArithmetic dynamicsBase-dependent integer sequencesHarv and Sfn no-target errors