If a column of numbers is 2, 5, 9, 14, 20, ..., then what is the 50th number in this column.
如果一列数是2，5，9，14，20，…，那么在这列数中第50个数是多少．
<gadget id="calculator">2 + 51</gadget>
<output>53</output>

<gadget id="calculator">50 / 2</gadget>
<output>25</output>

<gadget id="calculator">53 * 25</gadget>
<output>1_325</output>

<result>1_325</result>