Hexagonal pyramidal number: Difference between revisions

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Line 1: #REDIRECT [[Pyramidal number]] ~~A '''hexagonal pyramidal number''' is a [[pyramidal number]] formed by adding the first ''n'' [[hexagonal number]]s. The first few hexagonal pyramidal numbers are:~~ {{R from merge}} ~~:{{num\|1}}, {{num\|7}}, {{num\|22}}, {{num\|50}}, {{num\|95}}, {{num\|161}}, {{num\|252}}, 372, 525, 715, 946, 1222, 1547, 1925 {{OEIS\|A002412}}.~~ ~~The ''n''th number in this sequence, representing the sum of the first ''n'' [[hexagonal number]]s, is given by the formula~~ ~~:<math>\frac{n(n+1)(4n-1)}{6}.</math>~~ ~~== References ==~~ *[http://mathworld.wolfram.com/HexagonalPyramidalNumber.html Hexagonal pyramidal number at MathWorld] ~~{{Classes of natural numbers}}~~ ~~[[Category:Figurate numbers]]~~ ~~{{numtheory-stub}}~~