or plain math: n(n+1)/2 | Hacker News

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		karanbhangui on Nov 25, 2009 \| parent \| context \| favorite \| on: I wear your shirt or plain math: n(n+1)/2

mahmud on Nov 27, 2009 [–]

How quickly can you generalize the plain math formula to these sequences: http://www.research.att.com/njas/sequences/index.html

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