Among all prime numbers less than 30, are there two prime numbers whose difference and sum of squares are both prime numbers? If so, how many groups are there? If not, please explain why.
在小于30的所有质数种，是否存在差与平方和都是质数的两个质数？若存在，有几组？若不存在，请说明理由．
<gadget id="calculator">5 - 2</gadget>
<output>3</output>

<result>3</result>