Given the sequence 2, 5, 8, 11, 14, 17..., what is the 16th item of the sequence.
已知数列2，5，8，11，14，17…，该数列的第16项是多少．
<gadget id="calculator">5 - 2</gadget>
<output>3</output>

<gadget id="calculator">16 - 1</gadget>
<output>15</output>

<gadget id="calculator">3 * 15</gadget>
<output>45</output>

<gadget id="calculator">2 + 45</gadget>
<output>47</output>

<result>47</result>