Pattern Recognition -95

Find out the next two numbers in the series. 
17,19,22,26,28,31,35,37,_,_,......

Answer

17,  19,    22,    26,  28 ,   31,  35,   37, _, _, ......
   +2    +3    +4    +2   +3    +4   +2

Next two numbers    37+3 =40
                             40+4 =44

17,  19,    22,    26,  28 ,   31,  35,   37, 40, 44, ......