若a1=3,an+1=3an+3^n+1 1)设bn=an/3^n 证明:数列{bn}是等比数列 (2)求数列{an}的前n项和Sn

数列｛an},a1=1,an+1=2an-n^2+3n,求｛an｝. a1=1,an+1=an/(3+an),求an=?（n为下标） an+1 ,n+1是下表 ,an+1=an^3 a1=2 ,求an 数列｛an｝满足a1=1,且an=an-1+3n-2,求an 在数列an中,a1=2 an+1=an+3n则an= 已知{an}满足a1=1.an=3*n+2An-1,求an 若a1=1,an=3的n次方乘以an-1,求an 已知数列{an}中,a1=1,an+1=3an/(an+3)(N∈N*),求通项an, 数列an满足a1=1/3,Sn=n(2n-1)an,求an 数列{an},a1=3,an*a(n+1)=(1/2)^n,求an a1=1,an+1=an+3^n-n,求an与sn 在数列｛an｝中,a1=3,a(n+1)=an+n,求an 已知数列｛an｝中,a(n+1)=an+2^n,a1=3,求an 在数列{an}中,a1=15,3a(n+1)=3an-2,n属于N*,若an 在｛an｝中,a1=1,an+1=3an+2n,试求｛an｝的通项an 数列{an}中,a1=3,an-an*an+1=1(n∈N*),An表示数列{an}的前n项之积,则A2009 已知数列｛an｝满足a1=4/3,且an+1=4（n+1）an/3an+n 在数列an中,a1=3,an+1=an+1/n(n+1),求通项an?