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

en-US/ˈsɛntɚd tɹaɪˈæŋɡjəlɚ ˈnʌmbɚ/
en-GB/ˈsɛntəd tɹaɪˈænɡjʊlə ˈnʌmbə/

Катэгорыі:

centered polygonal number