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---
id: 5900f3f11000cf542c50ff03
title: '問題 132大純元數因子'
challengeType: 5
forumTopicId: 301760
dashedName: problem-132-large-repunit-factors
---
# --description--
完全由 1 組成的數字稱爲純元數repunit。 我們定義 $R(k)$ 爲長度 $k$ 的純元數。
例如 $R(10) = 1111111111 = 11 × 41 × 271 × 9091$,則其素數因子的和爲 9414。
求 $R({10}^9)$ 的前 40 個素數因子的和。
# --hints--
`largeRepunitFactors()` 應該返回 `843296`
```js
assert.strictEqual(largeRepunitFactors(), 843296);
```
# --seed--
## --seed-contents--
```js
function largeRepunitFactors() {
return true;
}
largeRepunitFactors();
```
# --solutions--
```js
// solution required
```