若数列{an}满足:a1=1,an+1=2an(n∈N*),则a5=______;前8项的和S8=______.(用数字
1.若数列an满足:a1=1,a(n+1)=2an(n∈N+),则a5=?前8项的和S8=?
若数列an满足:a1=1,Sn-1=2an+Sn(n∈N+),求an前8项和S8
数列{an}的前n项之和Sn=n2+3n+1,则a1+a3+a5等于______.
已知数列{an}的前n项和Sn=n2+2n-1,则a1+a3+a5+…+a25=______.
已知a1=3,an-anan+1=1(n∈N+),An表示数列{an}的前n项之积,则A2010=______.
已知数列{an}满足a1=0,a2=1,an+2=3an+1-2an,则{an}的前n项和Sn=______.
如果数列{an}的前n项和Sn=n2+2n+1,那么a1+a3+a5+…+a21=______.
数列{an}的前n项和为Sn,若a1=1,an+1=3Sn(n≥1),则a6=______.
已知数列(an)满足a1=1,an+1=2an/an+2(n∈N*) 求a2,a3,a4,a5 猜想数列(an)的通项公
若数列{an}中,a1=3,且an+1=an2(n∈N*),则数列的通项an=______.
数列{an}的前n项和Sn=n2+1,则an=______.
已知数列{an}满足a1=1,an+1=Sn+(n+1)(n∈N*),其中Sn为{an}的前n项和,