1888888888domain: NAppears in sequencesPartial sums of A051109.at n=27A117727a(n) is the concatenation, in ascending order, of the set of digits 1,2,4,8 whose sum equals the n-th prime using a minimal number of digits.at n=20A166745a(n) = (17*10^n - 8)/9.at n=9A246059