🌐EnglishEnglishDeutschEspañolFrançaisРусский한국어日本語EntityQ3527095· pop 7· linked from 12 articlesJacobi's four-square theoremHow many ways that a positive integer can be represented as the sum of 4 squaresConnectionsInternational Standard Book NumberEntitynatural numberEntityCategoriesSquares in number theoryTheorems in number theory