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1 solution
P=12+23+34+45+...+20172018=(1+2+3+...+2017)*10+(2+3+...+2018)= 2 2 0 1 7 ∗ 2 0 1 8 ∗ 1 0 + 2 2 0 1 8 ∗ 2 0 1 9 -1 =22388700