Some natural numbers can be written in the form of the sum of a prime number and a composite number, and there are at least 4 such representations regardless of the order of the addends. What is the smallest of all natural numbers satisfying the above conditions?
有些自然数能够写成一个质数与一个合数之和的形式，并且在不计加数顺序的情况下，这样的表示方法至少有4种．所有满足上述条件的自然数中最小的一个是多少？
<gadget id="calculator">41 + 4</gadget>
<output>45</output>

<gadget id="calculator">2 + 45</gadget>
<output>47</output>

<result>47</result>