There is a series of numbers: 1, 4, 9, 16, 25, 36, 49, .... If they are arranged according to a certain rule, how much is the 30th number greater than the 10th number?
有一串数：1，4，9，16，25，36，49，…．它们按一定的规律排列，则第30个数比第10个数大多少．
<gadget id="calculator">30 ** 2</gadget>
<output>900</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">900 - 100</gadget>
<output>800</output>

<result>800</result>