🌐EnglishEnglishDeutschEspañolFrançaisItalianoPortuguêsSvenskaРусскийالعربية한국어中文日本語EntityQ663029· pop 15· linked from 236 articlesdecagonal numberinteger of the form 4n²−3n (where n ≥ 0)Available in 15 languagesFrançais中文日本語ItalianoالعربيةCzechemlFinnishHebrewHungarianRomanianConnectionsprime numberEntityfigurate numberEntityCategoriesFigurate numbers