3 6 18 July 8, 2019 16 32 64 128 3 6 18 72 3 6 18 72 next number 3 6 18 72 sequence 3 6 18 21 3 6 180 3 6 18 9 3 6 18 36 3 6 18 2 3 6 18 5 3 6 1800 3 6 18 12 3 6 18 8 3 6 18 30 3 6 18 72 missing number 3 6 18 lcm
