The Erdős–Straus conjecture

Show that 4/n is a sum of three unit fractions with distinct denominators for every n > 2, or find a counterexample.

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1	{
2	"domain": "mathematics",
3	"topics": [
4	"number-theory"
5	],
6	"type": "construction",
7	"also": [
8	"proof"
9	],
10	"source": {
11	"key": "erdos",
12	"name": "Erdős Problems",
13	"url": "https://www.erdosproblems.com/242",
14	"id": "242",
15	"curator": "Thomas Bloom",
16	"poser": "Paul Erdős and Ernst Straus",
17	"status": "open",
18	"as_of": "2026-10-20",
19	"catalog": "0521c19bbd38"
20	},
21	"review": true,
22	"approval": "first-time"
23	}