# Størmer number

> positive integer n for which the greatest prime factor of n2 + 1 is greater than or equal to 2n

**Wikidata**: [Q430033](https://www.wikidata.org/wiki/Q430033)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Størmer_number)  
**Source**: https://4ort.xyz/entity/st-rmer-number