The Swiss middle school teacher Balmer successfully obtained the Balmer formula from the spectral data (9/5), (16/12), (25/21), (36/32), ..., thus opening the door to the mysteries of the spectrum. Please write down the number of the seventh data according to this rule.
瑞士中学老师巴尔末成功地从光谱数据(9/5)、(16/12)、(25/21)、(36/32)、…中得到巴尔末公式，从而打开了光谱奥妙的大门．请你按这种规律写出第七个数据是多少．
<gadget id="calculator">7 + 2</gadget>
<output>9</output>

<gadget id="calculator">9 * 9</gadget>
<output>81</output>

<gadget id="calculator">7 * 11</gadget>
<output>77</output>

<gadget id="calculator">81 / 77</gadget>
<output>81/77 = around 1.051948</output>

<result>81/77 = around 1.051948</result>