Revision as of 19:13, 3 October 2013 edit David Eppstein (talk \| contribs) Autopatrolled, Administrators 235,660 edits m make formula into display style; avoid redirect ← Previous edit		Revision as of 20:04, 30 December 2017 edit undo Nmohar (talk \| contribs) 4 edits m Edited for clarity of relation to hexagonal numbers Next edit →
Line 1: A '''hexagonal pyramidal number''' is a [[pyramidal number]] formed by adding the first ~~few~~''n'' [[hexagonal number]]s. The first few ofhexagonal ~~these~~pyramidal numbers are: :{{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>

Hexagonal pyramidal number: Difference between revisions