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Centered nonagonal number
Y 78%
Centered figurate number that represents a nonagon with a dot in the center
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Instances
2
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Y 78%
1
Number
10
Natural number
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A centered nonagonal number (or centered enneagonal number) is a centered figurate number that represents a nonagon with a dot in the center and all other dots surrounding the center dot in successive nonagonal layers. The centered nonagonal number for n layers is given by the formula

Instance of
type of integer
Subclass of
Centered polygonal number
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