249264domain: NAppears in sequencesa(n) = lcm(n, A025586(n)), least common multiple of n and largest value in 3x+1 iteration list started at n.at n=26A087259a(n) = lcm(4n, A025586(4n)), least common multiple of 4n and the largest value in 3x+1 iteration list started at 4n.at n=26A087261