--- id: 5900f3b41000cf542c50fec7 challengeType: 5 title: 'Problem 72: Counting fractions' videoUrl: '' localeTitle: 问题72：计算分数 --- ## Description

考虑分数，n / d，其中n和d是正整数。如果是

说明

测试

 tests: - text: <code>euler72()</code> should return 303963552391. testString: 'assert.strictEqual(euler72(), 303963552391, "<code>euler72()</code> should return 303963552391.");'

挑战种子

 function euler72() { // Good luck! return true; } euler72();

解

 // solution required

## Instructions

## Tests

```yml tests: - text: euler72()应该返回303963552391。 testString: 'assert.strictEqual(euler72(), 303963552391, "euler72() should return 303963552391.");' ```

## Challenge Seed

```js function euler72() { // Good luck! return true; } euler72(); ```

## Solution

```js // solution required ```