已知数列｛an}的前n项和是Sn,且Sn=3的n次方减1,设Bn=llog3(1+Sn+1),如何

设数列An的前n项和为Sn,已知a1=a,an+1=Sn+3n设Bn=Sn-3n次方,求数列Bn的通项公式 设数列{an}的前n项和为sn.已知a1=a,an+1=sn-3n,n∈N*,设bn=sn-3n,且bn≠0 "已知数列{an}的前n项和为Sn,且满足an+Sn=3-8/2n次方,又设bn=2n次方an" (1)求数列的通项公式 设数列{An}的前n项和为Sn,已知A1=a,A(n+1)=Sn+3∧n,n是正整数,设Bn=Sn-3∧n,求数列{Bn 设数列﹛an﹜的前n项和为Sn,已知a1=5,an+1=Sn+3的n次方（n∈N*）.令bn=Sn-3的n次方,求证﹛b 设数列{an}的前n项和为Sn已知a1=a,a(n+1）=Sn+【3的n次方】n∈正整数设bn=Sn-[3的n次方]求{ 已知数列{an}的前N项和为Sn 且an+1=Sn-n+3,a1=2,设Bn=n/Sn-n+2前N项和为Tn 求证Tn 设数列{an}的前n项和为Sn,已知a1=a,an+1=Sn+3^n,n∈N+.设bn=Sn+3n,求数列{bn}的通项 设数列{an}的前n项和为sn,已知a1=a,an+1=sn+3^n,n∈N* (1)设bn=sn-3^n,求数列{bn 已知数列an的前n项的和为sn,且对任意n∈N有an+sn=n,设bn=an-1,求证数列bn是等比数列 已知数列an的前n项和为Sn,且2Sn=2-(2n-1)an设bn=(2n+1)Sn,求数列bn的通项公式 设等差数列{an}的前 n项和为Sn,且 Sn=(an+1)^/2(n属于N*)若bn=(-1)nSn,求数列{bn}的