Will the visible-prime Ulam walk ever visit 571?
TheoremDB P11951 · discrete dynamical systems
Inferred from the community field; finer classification has not been reviewed.
Problem statement
On the standard Ulam spiral, start at the square . Repeatedly move to the closest unvisited prime square visible along a primitive lattice direction, breaking distance ties by the smaller prime. Does this walk ever visit the prime square at coordinates ?
Lean 4
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Progress & source assessment
Source-reported assessment, retrieved 8 September 2026. Frontier Science has not independently reviewed this status.
Open. No signed Lean verification is attached to this problem or its selected resolution.
- [1]TheoremDB P11951 link
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