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- Octagonal_number abstract "An octagonal number is a figurate number that represents an octagon. The octagonal number for n is given by the formula 3n2 - 2n, with n > 0. The first few octagonal numbers are:1, 8, 21, 40, 65, 96, 133, 176, 225, 280, 341, 408, 481, 560, 645, 736, 833, 936 (sequence A000567 in OEIS)Octagonal numbers can be formed by placing triangular numbers on the four sides of a square. To put it algebraically, the nth octagonal number iswhich simplifies to the formulas given above.The octagonal number for n can also be calculated by adding the square of n to twice the (n - 1)th pronic number, or, to put it algebraically, .Octagonal numbers consistently alternate parity.Octagonal numbers are occasionally referred to as "star numbers," though that term is more commonly used to refer to centered dodecagonal numbers.".
- Octagonal_number wikiPageID "538132".
- Octagonal_number wikiPageRevisionID "600418420".
- Octagonal_number hasPhotoCollection Octagonal_number.
- Octagonal_number subject Category:Figurate_numbers.
- Octagonal_number type Abstraction100002137.
- Octagonal_number type Amount105107765.
- Octagonal_number type Attribute100024264.
- Octagonal_number type FigurateNumbers.
- Octagonal_number type Magnitude105090441.
- Octagonal_number type Number105121418.
- Octagonal_number type Property104916342.
- Octagonal_number comment "An octagonal number is a figurate number that represents an octagon. The octagonal number for n is given by the formula 3n2 - 2n, with n > 0. The first few octagonal numbers are:1, 8, 21, 40, 65, 96, 133, 176, 225, 280, 341, 408, 481, 560, 645, 736, 833, 936 (sequence A000567 in OEIS)Octagonal numbers can be formed by placing triangular numbers on the four sides of a square.".
- Octagonal_number label "Nombre octogonal".
- Octagonal_number label "Numero ottagonale".
- Octagonal_number label "Número octogonal".
- Octagonal_number label "Octagonal number".
- Octagonal_number label "عدد مثمن".
- Octagonal_number label "八邊形數".
- Octagonal_number sameAs Osmiúhelníkové_číslo.
- Octagonal_number sameAs Número_octogonal.
- Octagonal_number sameAs Nombre_octogonal.
- Octagonal_number sameAs Numero_ottagonale.
- Octagonal_number sameAs 팔각수.
- Octagonal_number sameAs m.02mxdl.
- Octagonal_number sameAs Q2634498.
- Octagonal_number sameAs Q2634498.
- Octagonal_number sameAs Octagonal_number.
- Octagonal_number wasDerivedFrom Octagonal_number?oldid=600418420.
- Octagonal_number isPrimaryTopicOf Octagonal_number.