(1)若数列{an}满足：a1=1,an+1=2an+1(n属于正整数）,则该数列的通项公式an=?(2)在等差数列{an}中,an=2n-49,使该数列的前n项之和用Sn取得最小值时n的值为多少?

数列{An}满足a1=1/2,a1+a2+..+an=n方an,求an 已知数列{an}满足a1=1 an+1=an/(3an+1) 则球an 数列{an}满足a1=a,an+1=1+1/an.若3/2 若数列an满足a1=1,且an+1=an/1+an.证明:数列1/an为等差数列,并求出数列an的通项公 关于数列、等差数列的题目设数列an满足an+1=an-2且a1=241）判断an是什么数列2）若an 数列{an}满足a1=1 an+1=2n+1an/an+2n 已知数列{an}满足an+1=an+n,a1等于1,则an=? 数列｛an｝满足a1=1,且an=an-1+3n-2,求an 数列an满足a1=2,an+1=4an+9,则an=? 已知数列{an}满足an+1=2an+3.5^n,a1=6.求an 数列an满足a1=2,an+1=an²求an 数列an满足a1=2,an+1=an²求an 数列[An]满足An+1-An+3=0,且A1=-5.求An. 若数列【an】满足a1等于1,An+1=2an+3n,则数列的项A5 若数列{An},满足关系a1=2,an+1=3an+2,求数列的通项公式 若数列{an}满足a1=1,a2=5且an+2=an+1-an,求a2000 若数列an满足a1=0.5 an+1=an/5an+1 则an=?an+1为an的后一项 已知数列{an}中满足(An+1-An)(An+1+An)=16,且a1=1,an