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Eight: 1 3 9 27 37 111 333 999.
Yes, it is. If you go far enough you'd get to 333x3 = 999. The trick to find out if a number is in the 3 times table is simply dividing by 3 and see if you end up with the number zero in the end.
1, 3, 9, 263, 789 and 2367.
how many times can 18 go into 2,000
how many times can 72 go into 204