Numbers Deserving Blanks

How was series looking?

Let's take a look at the series once again.

4, 6, 12, 18, 30, 42, 60, 72, 102, 108,_,_,_ 

If we carefully observe the series, we can find that every number is in between 2 PRIME numbers.

4 is in between 3 and 5. 

6 is in between 5 and 7.

12 is in between 11 and 13.

So on........

108 is in between 107 and 109.

Hence next numbers should be 138, 150 and 180!