数列{an}的前n项和为Sn,若a1=1,an+1=3Sn(n≥1),则a6=( )
数列{an}的前n项和为Sn,若a1=1,an+1=3Sn(n≥1),则a6=( )
数列{an}的前n项和为Sn,若a1=1,an+1=3Sn(n≥1),则a6=______.
数列{an}的前n项和为Sn,若a1=1,an+1=3Sn(n≧1)则a6=
设数列{an}的前n项和为Sn,若a1=1,Sn=2an+Sn+(n∈N+),则a6=
数列an的前n项和为Sn,a1=1,a(n+1)=3Sn,a6=?
设数列{An}的前n项和为Sn若An+1=3Sn,a1=1则a6=
已知数列{an}的前n项和为Sn,a1=-23,Sn+1Sn=an-2(n≥2,n∈N)
数列{an}的前n项和为Sn,若a1=1,a(n+1)=3Sn(n≥1),则a6=?答案是3×4^4
设数列{an}的前n项和为Sn,若a1=1,an+1=3Sn(n∈N*),则S6=( )
数列{an}的前n项和为Sn,已知A1=a,An+1=Sn+3^n(三的n次方),n∈N*
已知数列{an}的首项是a1=1,前n项和为Sn,且Sn+1=2Sn+3n+1(n∈N*).
设数列an的前n项和为Sn,a1=1 ,an = 2Sn²/2Sn-1 (n≥2)