The robot colors the positive integers starting from 1 from small to large according to the following rules: all positive integers that can be expressed as the sum of two composite numbers are colored red, and natural numbers that do not meet the above requirements are colored yellow. What is the 2013th number if the number in red goes down from small to large.
机器人对正整数从1开始由小到大按下面的规则进行染色：凡是能表示为两个合数之和的正整数都染成红色，不符合上述要求的自然数都染成黄色，如果被染成红色的数由小到大数下去，则第2013个数是多少．
<gadget id="calculator">2_013 + 9</gadget>
<output>2_022</output>

<result>2_022</result>