Winner 2: The six-pyramid construction Doug Williams, http://www.mav.vic.edu.au/PSTC/cc/pyramids.htmhttp://www.mav.vic.edu.au/PSTC/cc/pyramids.htm 6 identical sum of first n squares pyramids Fit them together to form a rectangular prism It has dimensions n, n+1, and 2n+1 Thus It's fairly easy to see that this works for n+1 if it works for n.
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