41 lines
624 B
Markdown
41 lines
624 B
Markdown
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---
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id: 5900f44b1000cf542c50ff5d
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title: 'Problem 222: Sphere Packing'
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challengeType: 5
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forumTopicId: 301865
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dashedName: problem-222-sphere-packing
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---
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# --description--
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What is the length of the shortest pipe, of internal radius 50mm, that can fully contain 21 balls of radii 30mm, 31mm, ..., 50mm?
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Give your answer in micrometres (10-6 m) rounded to the nearest integer.
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# --hints--
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`euler222()` should return 1590933.
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```js
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assert.strictEqual(euler222(), 1590933);
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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 euler222() {
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return true;
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}
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euler222();
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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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