There are several consecutive odd numbers starting from 1 written on the blackboard: 1, 3, 5, 7, 9, ... After erasing one of the odd numbers, the sum of all the remaining odd numbers is 2000. Find the odd number that was erased ?
黑板上写有从1开始的若干个连续的奇数：1、3、5、7、9、…擦去其中的一个奇数后，剩下的所有奇数之和为2000，求擦去的奇数是多少？
<gadget id="calculator">45 ** 2</gadget>
<output>2_025</output>

<gadget id="calculator">2_025 - 2_000</gadget>
<output>25</output>

<result>25</result>