Answer :
9, 9(2)=18, 9(3)=27, 9(4)=36 9(5)=45
9,18,27,36,45……..144
Not sure if this is what you are looking for. If the number of blanks is the amount of numbers allowed then the above will not work
9(13)=117, 9(14)=126, 9(15)= 135, 144
If you can only have 3 blanks then the second one could work.
Again, not sure if this is what you need. But hopefully it helps.
9,18,27,36,45……..144
Not sure if this is what you are looking for. If the number of blanks is the amount of numbers allowed then the above will not work
9(13)=117, 9(14)=126, 9(15)= 135, 144
If you can only have 3 blanks then the second one could work.
Again, not sure if this is what you need. But hopefully it helps.