There is a set of numbers: 1, 3, 4, 6, 7, 9, 10, 12... If you follow this rule, how much is the 84th.
有一组数：1、3、4、6、7、9、10、12…如果按这个规律第84个多少．
<gadget id="calculator">84 * 1.5</gadget>
<output>126</output>

<result>126</result>