For a seven-digit number, the number in the ones place is 8, the number in the tens place is 3, and the sum of any adjacent three numbers is 15. What is the seven-digit number?
一个七位数，个位上的数字是8，十位上的数字是3，任意相邻的三个数位上数字的和都是15，这个七位数是多少？
<result>8_438_438</result>