The answer is 13 and 5.
Therefore, the sequence in desending order is 37, 29, 21, 13, 5.
Therefore, the sequence in ascending order is 21, 29, 37, 45, 53.
The sequence to find the next two terms is the difference between these two numbers is 8 (eight).
If you subtract 37-8=29.
If you subtract 29-8=21.
If you subtract 21-8=13.
If you subtract 13-8=5.
So, the answer is 13 and 5 (desending order).