In 2, 5, 10, 17, how much, 37. Fill in a number in the square brackets to make this column of numbers have the same characteristics.
在2、5、10、17、多少、37．中括号内填上一个数，使这列数有同样的特点．
<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<gadget id="calculator">25 + 1</gadget>
<output>26</output>

<result>26</result>