若数列{an}是等差数列,且对任意正整数n都有Sn3=(Sn)^3成立,求数列{an}的通项公式.已知无穷数列{an}的各项均为正整数,Sn数列的前n项和.(1)若数列{an}是等差数列,且对任意正整数n都有S(n^3)=(Sn
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