Talk:Squared triangular number: Difference between revisions

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{{Math rating|class=C|importance=low|field=number theory}}
 
==Visual proof==
It would be nice to include the picture proof from http://users.tru.eastlink.ca/~brsears/math/oldprob.htm#s32, since it is clearer than the one already on this page, but I am not sure about the copyright status of the images. Please advise.