整数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987e30395d91964ebd0395faf2f66600.png)
的排列满足:从第二个数开始,每个数或者大于它之前的所有数,或者小于它之前的所有数.则这样的排列个数共有__________ 个.(用含
的代数式表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987e30395d91964ebd0395faf2f66600.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1eda60b65f47b1a26a47243fa5b1b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
更新时间:2018-08-01 11:09:12
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【推荐1】洛萨
科拉茨
Collatz,
是德国数学家,他在1937年提出了一个著名的猜想:任给一个正整数n,如果n是偶数,就将它减半
即
;如果n是奇数,则将它乘3加
即
,不断重复这样的运算,经过有限步后,一定可以得到
如初始正整数为6,按照上述变换规则,我们得到一个数列:6,3,10,5,16,8,4,2,
对科拉茨
猜想,目前谁也不能证明,更不能否定
现在请你研究:如果对正整数
首项
按照上述规则施行变换
注:1可以多次出现
后的第八项为1,则n的所有可能的取值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c97ec04a1aa7ac6fce72d589864940a2.png)
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【推荐2】下图中的三个正方形块中,着色正方形的个数依次构成一个数列的前3项,设这个数列为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e4487468ab2823d6dbf7f0ebd2eb38.png)
________ ;数列
的通项公式为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e4487468ab2823d6dbf7f0ebd2eb38.png)
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【推荐1】对正整数
的三次幂可用奇数进行以下方式的“分拆”:
,
,
,
,……,依此类推,若
的“分拆”中含有奇数2015,则
的值为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ee933d4428d2c0962268520ac3c12a.png)
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【推荐2】《聊斋志异》中有这样一首诗:“挑水砍柴不堪苦,请归但求穿墙术.得诀自诩无所阻,额上坟起终不悟.”在这里,我们称形如以下形式的等式具有“穿墙术”:
,
,
,
,则按照以上规律,若
具有“穿墙术”,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
__________ .
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