# Sierpinski number

> number k which k*2^n+1 is composite with all n

**Wikidata**: [Q547430](https://www.wikidata.org/wiki/Q547430)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Sierpiński_number)  
**Source**: https://4ort.xyz/entity/sierpinski-number


## References

1. Freebase Data Dumps. 2013