已知数列
的前
项和为
,且满足
,设
,若存在正整数
,使得
成等差数列,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff6d838c156e98b50813db582fcf7aac.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b63fde4208be2df928edefaa12dfa4d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab88d4788873dbeda770870ad00d8268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94da0cd42b1a1949427b5ca5dd80ae5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2fc41af0fa6ec283fcf3aa6c5102f6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff6d838c156e98b50813db582fcf7aac.png)
更新时间:2017-05-17 23:22:20
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【推荐1】已知数列
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【推荐2】已知各项都不为0的数列
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