设
表示正整数
的所有因数中最大的奇数与最小的奇数的等差中项,数列
的前
项和为
,那么
的值为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.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/b3505e1c60ee386b67c2ff40673ae52c.png)
更新时间:2018-08-27 15:09:43
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【推荐1】历史上数列的发展,折射出许多有价值的数学思想方法,对时代的进步起了重要的作用,比如意大利数学家列昂纳多·斐波那契以兔子繁殖为例,引入“兔子数列”:即1,1,2,3,5,8,13,21,34,55,89,144,233,….即
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【推荐2】对
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