6/1+12/1+20/1+30/1…+2005×2006/1
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6/1+12/1+20/1+30/1…+2005×2006/1
6/1+12/1+20/1+30/1…+2005×2006/1
6/1+12/1+20/1+30/1…+2005×2006/1