Hexagonal pyramidal number: Difference between revisions

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A '''hexagonal [[pyramidal number]]''' is a [[pyramidal number]] formed by adding the first few [[hexagonal numbers]]. The first few of these numbers are:

:{{num|1}}, {{num|7}}, {{num|22}}, {{num|50}}, {{num|95}}, {{num|161}}, {{num|252}}, 372, 525, 715, 946, 1222, 1547, 1925 {{OEIS|id=A002412}}.

The ''n''th number in this sequence is given by the formula

The numbers have the form:

<math>\frac{n(n+1)(4n-1)}\over6{6}.</math>

<math>{n(n+1)(4n-1)}\over6</math>

== References ==

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{{Classes of natural numbers}}

{{numtheory-stub}}

[[Category:Figurate numbers]]

{{numtheory-stub}}