39 lines
653 B
Markdown
39 lines
653 B
Markdown
---
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id: 5900f3e41000cf542c50fef7
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title: 问题120：方形剩余部分
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challengeType: 5
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videoUrl: ''
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dashedName: problem-120-square-remainders
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---
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# --description--
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设r是（a-1）n +（a + 1）n除以a2时的余数。例如，如果a = 7且n = 3，则r = 42：63 + 83 =728≡42mod 49.并且当n变化时，r也将变化，但是对于a = 7，结果是rmax = 42。对于3≤a≤1000，找到Σrmax。
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# --hints--
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`euler120()`应返回333082500。
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```js
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assert.strictEqual(euler120(), 333082500);
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```
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# --seed--
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## --seed-contents--
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```js
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function euler120() {
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return true;
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}
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euler120();
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```
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# --solutions--
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```js
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// solution required
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```
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