给定正整数n和实数M,对于满足条件:(a1)^2+[a(n+1)]^2≤M^2的所有等差数列:a1,a2,a3….,试求

给定正整数n和实数M,对于满足条件:(a1)^2+[a(n+1)]^2≤M^2的所有等差数列:a1,a2,a3….,试求 给定正整数n和正数b,对于满足条件a1-[a(n+1)]^2大于等于b的所有无穷等差数列{an},试求y=a(n+1)+ 设数列{an}对所有正整数n都满足：a1+2a2+2^2a3+…+2^(n-1)an=8-5n,求数列{an}的前n项和 数列[an]中,a1=1,对于所有的a≥2,n∈都有a1*a2*a3*.*an=n的平方,则a3+a5等于? 设数列{An}满足A1+3A2+3^2*A3+...+3^(n-1)*An=n/3,a属于正整数. 已知数列{an}满足a1+a2+a3+...+an=n^2+2n.(1)求a1,a2,a3,a4 已知数列｛an｝为等差数列,且a1=2,a1+a2+a3=12 令bn=3^a n,求数列{bn}的前n项和 设数列an满足a1+3a2+3^2a3+……+3^(n-1)an=n/3,a是正整数,设bn=n/an,求数列bn的前n 数列{an}满足an=2an-1+2^n+1(n为正整数,n≥2）,a3=27 (1)求a1,a2的值 设数列An对所有自然数n,都满足a1+2a2+2^2a3+…+2^n-1an=8-5n,求数列a n 的通项公式,求具体 已知数列{an}中满足a1=1,a(n+1)=2an+1 (n∈N*),证明a1/a2+a2/a3+…+an/a(n+1 设数列an的前n项和为sn,满足2Sn=a（n+1）-2^(n+1)+1,n∈N,且a1,a2+5,a3成等差数列