4194310domain: NAppears in sequencesa(n) = 2^n + 6.at n=22A153972a(n) = smallest number that leads to a new cycle under the base-4 Kaprekar map of A165012.at n=26A165029a(n) is the next Ulam number (A002858) after 2^(n-1).at n=23A347212