Among the natural numbers between 1 and 100, what is the sum of exactly 3 factors?
1到100之间的自然数之中，恰有3个因数的总和等于多少．
<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">7 ** 2</gadget>
<output>49</output>

<gadget id="calculator">4 + 25 + 9 + 49</gadget>
<output>87</output>

<result>87</result>