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OpenStudy (anonymous):
What are triangular numbers, pentagonal numbers, etc?
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OpenStudy (kinggeorge):
Triangular numbers are of the form \[1+2+...+n=\frac{n(n+1)}{2}\]
OpenStudy (kinggeorge):
Square numbers are \[1,4,9,...\]
OpenStudy (unklerhaukus):
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