Home›Browse›square triangular number🌐EnglishEnglishDeutschEspañolFrançaisItalianoNederlandsPortuguêsSvenskaTiếng ViệtTürkçeРусскийالعربية中文日本語EntityQ1885380· pop 19· linked from 225 articlessquare triangular numberSign in to saveinteger that is both a perfect square and a triangular numberAvailable in 18 languagesEspañolFrançais中文日本語РусскийItalianoالعربيةHebrewHungarianNederlandsRomanianSlovenianSvenskaTamilTiếng ViệtTürkçeUkrainianvia Wikidata sitelinks · CC0