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curriculum/challenges/italian/10-coding-interview-prep/project-euler/problem-222-sphere-packing.md

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