Item:Q8766: Difference between revisions
Created a new Item: centered nonagonal number, subclass of centered polygonal number |
Created claim: defining formula (P333): C_{9,n}={\frac {9}{2}}n(n-1)+1={{9n^{2}-9n+2} \over 2} |
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| Property / instance of | |||
| Property / instance of: centered polygonal number / rank | |||
Normal rank | |||
| Property / instance of: centered polygonal number / qualifier | |||
| Property / instance of: centered polygonal number / qualifier | |||
| Property / subclass of | |||
| Property / subclass of: figurate number / rank | |||
Normal rank | |||
| Property / defining formula | |||
C_{9,n}={\frac {9}{2}}n(n-1)+1={{9n^{2}-9n+2} \over 2} | |||
| Property / defining formula: / rank | |||
Normal rank | |||
| Property / defining formula: / qualifier | |||
| Property / defining formula: / qualifier | |||
in defining formula: n\geq {1},n\in \mathbb {N} | |||
