1111111119domain: NAppears in sequencesn 1's followed by n.at n=8A075842a(n) = (10^n + 71)/9.at n=9A165247a(n) is the smallest positive integer k which has the same set of digits as n, and k is divisible by each nonzero digit of n, or -1 if no such number exists.at n=18A390761