已知公差不为0的等差数列{an}的首项a1=2,且,,成等比数列.
(1)求数列{an}的通项公式;
(2)若数列{bn}满足b1+2b2+22b3+…+2n-1bn=an,求数列{nbn}的前n项和Tn..
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已知公差不为0的等差数列{an}的首项a1=2,且,,成等比数列.
(1)求数列{an}的通项公式;
(2)若数列{bn}满足b1+2b2+22b3+…+2n-1bn=an,求数列{nbn}的前n项和Tn..