Square triangular number: Difference between revisions

Revision as of 17:03, 3 May 2007

Revision as of 16:56, 21 June 2007

Line 18:

which is an instance of Pell's equation and is solved by the [[Pell number]]s.

We get the [[recursion]]

:<math>m_{k}=6m_{k-1}-m_{k-2}</math>

The ''k^th'' triangular square ''N_k'' is equal to the ''s^th'' perfect square and the ''t^th'' triangular number, such that