Pattern Recognition - 119

Find out the next two numbers in the series.
5 , 13 , 17 ,19 , 21 , 25, _ ,_ ,............................

Answer
5 ,     13 ,       17 ,    19   , 21 ,   25, _ ,_ ,............................
    +8       +4       +2     +2     +4

  +8       +4       +2     +2     +4  Next two numbers +8, +4

Next two numbers in the series  25 + 8 =33    33 +4 =37

5 ,  13 ,  17 ,  19  , 21 ,   25,  33 , 37 ,............................