2018-10-10 22:03:03 +00:00
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---
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id: 5900f44e1000cf542c50ff60
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2020-12-16 07:37:30 +00:00
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title: 问题225：Tribonacci非除数
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2018-10-10 22:03:03 +00:00
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challengeType: 5
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videoUrl: ''
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---
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2020-12-16 07:37:30 +00:00
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# --description--
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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序列1,1,1,3,5,9,17,31,57,105,193,355,653,1201 ......由T1 = T2 = T3 = 1和Tn = Tn-1 + Tn定义-2 + Tn-3。
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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可以证明27不会划分该序列的任何项。实际上，27是具有该属性的第一个奇数。
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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找到不分割上述序列的任何项的第124个奇数。
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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# --hints--
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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`euler225()`应该返回2009年。
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2018-10-10 22:03:03 +00:00
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```js
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2020-12-16 07:37:30 +00:00
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assert.strictEqual(euler225(), 2009);
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2018-10-10 22:03:03 +00:00
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```
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2020-12-16 07:37:30 +00:00
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# --solutions--
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2020-08-13 15:24:35 +00:00
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