LCM-8 ("Mike Boat") is a river boat and mechanized landing craft used by the United States Navy and Army during the Vietnam War and subsequent operations.
If you mean 17 and 13 then the LCM is 221
If you mean 5 and 8 then the LCM is 40
If you mean: 8, 20 and 12 then the LCM is 120
If you mean: 49, 28 and 14 then the LCM is 196
The least common multiple for 1,235 and 12,685 is 3,133,195.
If you mean an inflatable boat - sure
To work out the LCM, you need two numbers. You have provided only one so you can't work out the LCM.
If you mean 17 and 13 then the LCM is 221
If you mean: 14 and 62 then the LCM is 434
If you mean 7 and 14 then the LCM is 14
If you mean 5 and 8 then the LCM is 40
If you mean 12 and 48 then the LCM is 48
If you mean 18 and 36 then the LCM is 36
If you mean 4 and 28 then the LCM is 28
It is spelled U-Boat not you-boat.
If you mean: 24, 72 and 144 then the LCM is 144
If you mean: 10, 15 and 30 then LCM is 60