Item:Q8760: Difference between revisions
Created a new Item: 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 |
Created claim: defining formula (P333): C_{3,n}={\frac {3}{2}}n(n-1)+1={{3n^{2}-3n+2} \over 2} |
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| Property / subclass of | |||
| Property / subclass of: centered polygonal number / rank | |||
Normal rank | |||
| Property / subclass of: centered polygonal number / qualifier | |||
| Property / subclass of: centered polygonal number / qualifier | |||
| Property / defining formula | |||
C_{3,n}={\frac {3}{2}}n(n-1)+1={{3n^{2}-3n+2} \over 2} | |||
| Property / defining formula: / rank | |||
Normal rank | |||
