What is the pattern between 5,3,9,7,13

Answer it takes away 2 than adds 3 and takes away 2 than instead of adding 3 on the fourth number it adds 6 so maybe it doubles the number it adds every time or it adds three onto the last number it added with and continues like that.

Step-by-step explanation:

A - If a number has two digits, then the sum of its digits is less than the value of the original two-digit number.  

Step-by-step explanation:

It was the answer on the test