Find the law and fill in the numbers: 1, 6, 16, how much, 51.
找规律填数：1，6，16，多少，51．
<gadget id="calculator">10 + 5</gadget>
<output>15</output>

<gadget id="calculator">16 + 15</gadget>
<output>31</output>

<result>31</result>