🌐EnglishEnglishDeutschEspañolFrançaisItalianoNederlandsPortuguêsРусский中文日本語EntityQ325978· pop 15· linked from 232 articlescongruent numberpositive integer that is the area of a right triangle with three rational number sidesAvailable in 15 languagesEspañolFrançaisDeutsch中文日本語РусскийPortuguêsItalianoChuvashHebrewConnectionsprime numberEntityfigurate numberEntityCategoriesArithmetic problems of plane geometryElliptic curvesTriangle geometryUnsolved problems in number theory