1, 6, 21, 66, 201, 606, … 1 + 2 + 3 = 6 6 + 7 + 8 =…

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6 years ago

  1 +   2 +   3 =   6
  6 +   7 +   8 =  21
 21 +  22 +  23 =  66
 66 +  67 +  68 = 201
201 + 202 + 203 = 606
                …