Positive integers normally form an arithmetic sequence such that in this case the initial term is 1 and the common difference is 1. The number of terms is 2018 and therefore n = 2018 Sn= n/2( 2a+ (n-1)d) where Sn is the sum of n terms, a is the first term and d is the common difference. Substituting the unknowns with the values we get Sn = 2018/2 (2 + (2017) 1) = 2018/ 2 (2019) = 4074342/2 = 2037171 Therefore the sum of the first 2018 positive integer is 2037171.
