# 1999

> natural number

**Wikidata**: [Q842838](https://www.wikidata.org/wiki/Q842838)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/1999_(number))  
**Source**: https://4ort.xyz/entity/1999-q842838


## References

1. [Source](https://oeis.org/A063980/b063980.txt)