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 entity: Q190890

P2534	defining formula	Math	$C_{3, n} = \frac{3}{2} n (n - 1) + 1 = \frac{3 n^{2} - 3 n + 2}{2}$	???
P7235	in defining formula	Math	$n$	???
P31	instance of	...	Q77358734 (type of integer)	type of integer
P6104	maintained by WikiProject	...	Q8487137 (WikiProject Mathematics)	WikiProject Mathematics
P279	subclass of	...	Q190898 (centered polygonal number)	centered polygonal number

External Ids

P646	Freebase ID	/m/03hrq4
P2812	MathWorld ID	CenteredTriangularNumber
P6366	Microsoft Academic ID (discontinued)	14688073
P829	OEIS ID	A005448

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