已知等比数列{an}是递增数列,Sn是{an}的前n项和,若a1,a3是方程x2-5x+4=0的两个根,则S6=________.
已知数列{an}的前n项和为Sn,a1=1,Sn+1=4an+1,设bn=an+1-2an.证明:数列{bn}是等比数列.
等比数列{an}的前n项和为Sn,已知a1+an=66,a2an-1=128,Sn=126,求n和公比q的值.
若数列{an}满足lgan+1=1+lgan,a1+a2+a3=10,则lg(a4+a5+a6)=________.
等比数列{an}的前n项和为Sn,已知S3=a2+10a1,a5=9,则a1=________.
若数列{an}的前n项和为Sn=an+,则数列{an}的通项公式是an=________.