{
  "prompt": {
    "id": "maths-09",
    "category": "maths",
    "kind": "puzzle",
    "title": "Collatz conjecture",
    "text": "Pick a starting number and walk the Collatz sequence. Why do you think this simple rule has resisted proof for so long?",
    "tags": [
      "open problems"
    ]
  },
  "recent_replies": []
}