求所有素数p,使得
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63de2bc403dd111b66c524ae1843d1b1.png)
2018高三·全国·竞赛 查看更多[1]
更新时间:2018-12-30 18:24:01
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解答题-证明题
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【推荐2】若一个两位正整数
的个位数为4,则称
为“好数”.
(1)求证:对任意“好数”
一定为20的倍数;
(2)若
,且
为正整数,则称数对
为“友好数对”,规定:
,例如
,称数对
为“友好数对”,则
,求小于70的“好数”中,所有“友好数对”的
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(1)求证:对任意“好数”
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36553a0a7c8d1b264da9fa523ce642f0.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d13a6e30a21289e94fc277cf8837689.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cd5371a6f0f82c65dd22f75f8b807c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/698c4d4e50062b4a7dd70fe1b4ab4fd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9ac064230ab6367a96d893d90e2eb05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5c6dff41808d7155650360fd48aa667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a70feb95addc50c555e2eb6ad82521ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d75f0e4f8c5195728e3e7675586a8513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9317cb763ff70bd19b2950e7f3f74399.png)
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解答题-问答题
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【推荐1】(1)证明:存在无穷多个正整数
,使
与
同时为合数.
(2)试判断是否存在正整数
,使得对于任意的
,总有
与
之一为质数?并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4477c21464761f33f2868cc1a5ba793d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e54ea1748b9fab39aa63880f8144d507.png)
(2)试判断是否存在正整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57cf2d8e3493cd94f7bfcd6f364f611f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/231ea48550a70f62093b235e6af8130a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf39b11306be8d751f3ff8c56581a8ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae568b146983e87abb32df272153dc8a.png)
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解答题-问答题
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【推荐2】已知数列
满足
.
(1)证明:
是正整数数列;
(2)是否存在
,使得
?并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df3f0a8c6cf53d0b0b71ccf8e6f5226a.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(2)是否存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39891fee58e55b44b4103f46c3608891.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c4122bdc1b2a61097735c85b2dd655c.png)
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