2018-10-10 18:03:03 -04:00
|
|
|
|
---
|
|
|
|
|
|
id: 5900f4651000cf542c50ff77
|
2020-12-16 00:37:30 -07:00
|
|
|
|
title: 问题248：Euler的totient函数等于13的数字！
|
2018-10-10 18:03:03 -04:00
|
|
|
|
challengeType: 5
|
|
|
|
|
|
videoUrl: ''
|
|
|
|
|
|
---
|
|
|
|
|
|
|
2020-12-16 00:37:30 -07:00
|
|
|
|
# --description--
|
2018-10-10 18:03:03 -04:00
|
|
|
|
|
2020-12-16 00:37:30 -07:00
|
|
|
|
φ（n）= 13的第一个数字n！是6227180929.找到第150,000个这样的数字。
|
2018-10-10 18:03:03 -04:00
|
|
|
|
|
2020-12-16 00:37:30 -07:00
|
|
|
|
# --hints--
|
2018-10-10 18:03:03 -04:00
|
|
|
|
|
2020-12-16 00:37:30 -07:00
|
|
|
|
`euler248()`应返回23507044290。
|
2018-10-10 18:03:03 -04:00
|
|
|
|
|
|
|
|
|
|
```js
|
2020-12-16 00:37:30 -07:00
|
|
|
|
assert.strictEqual(euler248(), 23507044290);
|
2018-10-10 18:03:03 -04:00
|
|
|
|
```
|
|
|
|
|
|
|
2020-12-16 00:37:30 -07:00
|
|
|
|
# --solutions--
|
2020-08-13 17:24:35 +02:00
|
|
|
|
|
