100433domain: NAppears in sequencesSmallest k whose 'Reverse and Subtract' trajectory has a preperiodic part of length n.at n=34A072138Least number that requires n steps to reach 0 by repeated application of f: x -> abs(x - reverse(x)).at n=34A109891Number of irredundant sets in the n-helm graph.at n=9A290588