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题1 (2002年第38届BMO第3题)数列{a_n}满足:a_0=1,a_(n+1)=1/2(3a_n+(?)),n∈N.求证:{a_n}中的各项都是正整数.
Question 1 (the 38th BMO question 3 of 2002) The sequence {a_n} satisfies: a_0=1, a_(n+1)=1/2(3a_n+(?)), n∈N. Verification: Each item in {a_n} is a positive integer.