A series of numbers according to 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, ..., counting from the first one on the left, what is the 135th number
一串数按1，2，2，3，3，4，4，5，5，6，…，从左面第一个数起，第135个数是多少
<gadget id="calculator">135 + 1</gadget>
<output>136</output>

<gadget id="calculator">136 / 2</gadget>
<output>68</output>

<result>68</result>