# Pell number

> denominator of close rational approximation to the square root of 2

**Wikidata**: [Q1386491](https://www.wikidata.org/wiki/Q1386491)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Pell_number)  
**Source**: https://4ort.xyz/entity/pell-number


## References

1. Freebase Data Dumps. 2013
2. BabelNet