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Cycles of length a power of two (the Erdős–Gyárfás conjecture)

Show that every finite graph with minimum degree 3 has a cycle of length 4, 8, 16 or another power of two, or find a counterexample.

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1{
2 "domain": "mathematics",
3 "topics": [
4 "graph-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/64",
14 "id": "64",
15 "curator": "Thomas Bloom",
16 "poser": "Paul Erdős and András Gyárfás",
17 "status": "open, $1000 prize",
18 "as_of": "2026-10-20",
19 "prize": "$1000",
20 "catalog": "0521c19bbd38"
21 },
22 "review": true,
23 "approval": "first-time"
24}