The least common multiple of two adjacent natural numbers is 72. What is the sum of these two natural numbers?
两个相邻自然数的最小公倍数是72，这两个自然数的和是多少．
<gadget id="calculator">2 * 2 * 2</gadget>
<output>8</output>

<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">8 + 9</gadget>
<output>17</output>

<result>17</result>