筛出这个素数，你用了多久？

恶有鳄抱

不二如是

0.002秒，课程：

Ewan-Ahiouy

这......

恶有鳄抱

Ewan-Ahiouy 发表于 2023-7-24 14:50
这......

歌者文明清理员

6666666666666666666

学习编程中的Ben

这是个素数？

Ewan-Ahiouy

不到0.1秒就知道他不是素数

zhangjinxuan

Is really a prime.

https://zh.numberempire.com/

zhangjinxuan

https://zh.numberempire.com/prim ... =check&_p1=2340

不瞒你说，他还真的是个质数

@Ewan-Ahiouy

歌者文明清理员

zhangjinxuan 发表于 2023-7-24 15:00
Is really a prime.

https://zh.numberempire.com/

这有几个9啊

zhangjinxuan

歌者文明清理员 发表于 2023-7-24 15:14
这有几个9啊

99999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999989999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999

歌者文明清理员

zhangjinxuan 发表于 2023-7-24 15:14
999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999 ...

琅琊王朝

wow

Ewan-Ahiouy

zhangjinxuan 发表于 2023-7-24 15:14
https://zh.numberempire.com/primenumbers.php?number=999999999999999999999999999999999999999999999999 ...

woc

zhangjinxuan

歌者文明清理员 发表于 2023-7-24 15:16

陶远航

zhangjinxuan 发表于 2023-7-24 15:14
https://zh.numberempire.com/primenumbers.php?number=999999999999999999999999999999999999999999999999 ...

3*33333333.....

zhangjinxuan

不二如是 发表于 2023-7-24 15:27
0.002秒，课程：

你家电脑好厉害

zhangjinxuan

陶远航 发表于 2023-7-24 15:26
3*33333333.....

还有个 8 ，你忽略了

陶远航

zhangjinxuan 发表于 2023-7-24 17:14
还有个 8 ，你忽略了

看见了

小甲鱼

不二如是 发表于 2023-7-24 15:27
0.002秒，课程：

第 10001 个质数才 104743，它这个光是位数就有 506 位了：

1. 99999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999989999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999

复制代码

单是判断这个数是否质数就要耗费海量时间，更别说要把它给筛出来了。