🌐EnglishEnglishBahasa IndonesiaDeutschEspañolFrançaisItalianoNederlandsРусскийالعربية日本語EntityQ2197859· pop 14· linked from 229 articlessquared triangular numberthe sum of the first n cubes, which equals the square of the nth triangular numberWikidata factsImageNicomachus theorem 3D.svgvia Wikidata · CC0Available in 14 languagesEspañolFrançaisDeutsch日本語РусскийItalianoالعربيةBahasa IndonesiaGreekHebrewConnectionsprime numberEntitytriangular numberEntityCategoriesAlgebraic identitiesInteger sequencesNumber theoryProof without words