2684647domain: NAppears in sequencesIn the '3x+1' problem, these values for the starting value set new records for highest point of trajectory before reaching 1.at n=31A006884'3x+1' record-setters (blowup factor).at n=16A025587Least number whose Collatz 3x+1 trajectory contains a number >= 2^n.at n=38A222292