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题 已知数列{a_n}是正项数列,其前n项和为S_n,并且对于所有的自然数n,a_n与2的等差中项等于S_n与2的等比中项。 (Ⅰ)写出数列{a_n}的前3项;
The problem is that the known sequence {a_n} is a positive sequence, and its first n terms are S_n, and for all natural numbers n, the equidistances of a_n and 2 are equal to equal terms of S_n and 2. (I) Write the first 3 items of the series {a_n};