Square pyramidal number: Revision history

18 December 2014

• curprev 00:3800:38, 18 December 2014 en>David Eppstein m 10,632 bytes +109 authorlink Jesús A. De Loera

4 February 2014

• curprev 16:3616:36, 4 February 2014 en>TakuyaMurata m 10,523 bytes −16 →Formula

30 December 2013

• curprev 23:3423:34, 30 December 2013 en>Little Mountain 5 m 10,539 bytes +10,539 →Derivation of the summation formula: "now there"→"there are" per edit request

4 June 2012

• curprev 20:0420:04, 4 June 2012 en>Helder.wiki 7,620 bytes +7,620 +ref for "\sum_{k=1}^nk^2 = \frac{n(n + 1)(2n + 1)}{6}": Hopcroft, Motwani & Ullman (2007), p. 20