If three terms are inserted between every adjacent two terms of the arithmetic sequence 2, 6, 10, ... so that they form a new arithmetic sequence, then the 10th item of the original sequence is the number one of the new sequence.
若在等差数列2，6，10，…的每相邻两项中间插入三项，使它们构成一个新的等差数列，则原数列的第10项是新数列的第多少项．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">3 * 9</gadget>
<output>27</output>

<gadget id="calculator">10 + 27</gadget>
<output>37</output>

<result>37</result>