已知数列{a
n}满足a
1=1,a
2=2,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183540428364188/SYS201310241835404283641018_ST/0.png)
=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183540428364188/SYS201310241835404283641018_ST/1.png)
(n∈N
+)(Ⅰ) 试求a
2011的值;
(Ⅱ)记数列{
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183540428364188/SYS201310241835404283641018_ST/2.png)
}(n∈N
+}的前n项和为S
n,若对n∈N
+恒有a
2-a>S
n+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183540428364188/SYS201310241835404283641018_ST/3.png)
,求a的取值范围.
考点分析:
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