The sum of 7 natural numbers is 259. If these 7 natural numbers are arranged in a row from small to large, the difference between two adjacent numbers is 8. What is the sixth natural number?
7个自然数的和是259，将这7个自然数从小到大排成一行，相邻两个数的差都是8，那么，第6个自然数是多少．
<gadget id="calculator">259 / 7</gadget>
<output>37</output>

<gadget id="calculator">8 * 2</gadget>
<output>16</output>

<gadget id="calculator">37 + 16</gadget>
<output>53</output>

<result>53</result>