# Jacobi's four-square theorem

> How many ways that a positive integer can be represented as the sum of 4 squares

**Wikidata**: [Q3527095](https://www.wikidata.org/wiki/Q3527095)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Jacobi's_four-square_theorem)  
**Source**: https://4ort.xyz/entity/jacobi-s-four-square-theorem