等差数列{an}的各项均为正整数,a1=3,前n项和为Sn,等比数列{bn}中,b1=1,且b2S2=64,{ban}是公比为64的等比数列.(1)求{an}与{bn};(2)证明:1/S1+1/S2+…+1/Sn<3/4.

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