Difference between revisions of "Figurate numbers"

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Revision as of 18:30, 8 July 2011

Most of us are familiar with triangular numbers, such as the arrangement of ten bowling pins in a triangle,

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or square numbers,

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but we don't necessarily know how their arithmetic works, or whether we can do the same with, say, pentagons.

Can we learn something by telling a turtle how to make these numbers? Let's try.