Use the numbers 1, 2, 3, 4, 5, 6, 7, 8, and 9 to form a minimum nine-digit number, so that the sum of its adjacent two numbers is a composite number. So, what is this number.
用数字1、2、3、4、5、6、7、8、9组成一个最小的九位数，使它的相邻二数字之和都是合数．那么，这个数是多少．
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