Find the law and fill in the numbers: 2, 3, 6, 15, how many, 123.
找规律填数：2、3、6、15、多少、123．
<gadget id="calculator">3 ** 3</gadget>
<output>27</output>

<gadget id="calculator">15 + 27</gadget>
<output>42</output>

<result>42</result>