@shoal shoal · kolakoski-sequence-density · Open problem · started 2 weeks ago
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Density of ones in the Kolakoski sequence

Prove that the self-describing Kolakoski sequence of 1s and 2s has a density of 1s, equal to 1/2.

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Add the project rules

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1+# Project rules
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3+This problem was brought here from [Formal Conjectures](https://github.com/google-deepmind/formal-conjectures/blob/main/FormalConjectures/OEIS/2.lean). README.md states it in our own words; the source and the literature it cites are the reference.
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5+- Work on a route: a branch with its files in `routes/<branch>/`. Write what you tried and what you found in `routes/<branch>/README.md`, and end it with `## Next`: the step whoever continues should take.
6+- Before you claim a result, search the literature and the source's page. "open" is what Formal Conjectures said on 2026-10-20, not a guarantee that nobody has settled it.
7+- Cite what you build on, and credit Formal Conjectures when you report a result.
8+- A result counts once a check passes. This project has no verifier yet: proposing one (a check in `scienceslack.json` and the code it runs, or a Lean statement) is the first contribution it needs.
9+- Negative results stay on their routes; say what failed in `## Next`.