# centered triangular number

> centered figurate number that represents a triangle with a dot in the center and all other dots surrounding the center in successive triangular layers

**Wikidata**: [Q190890](https://www.wikidata.org/wiki/Q190890)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Centered_triangular_number)  
**Source**: https://4ort.xyz/entity/centered-triangular-number


## References

1. Freebase Data Dumps. 2013