123345domain: NAppears in sequencesa(n) = min{p + q + r + ...} where p,q,r,... are distinct unary numbers - containing only ones, i.e., of the form (10^k - 1)/9 - formed by using a total of n ones.at n=17A110380a(n) = (A114043(n) - 1)/2.at n=29A115005Least number x such that x^n has n digits equal to k. Case k=5.at n=34A285452