The sum of 41 consecutive odd numbers is 2173, what is the largest one.
41个连续奇数的和是2173，其中最大的一个是多少．
<gadget id="calculator">20 * 2</gadget>
<output>40</output>

<gadget id="calculator">53 + 40</gadget>
<output>93</output>

<result>93</result>