| $\frac{2}{\pi}\approx 0.6366197724$ | [CH1964] | |tracked since 2026-07-24 — no movement seen yet
Lower bound, last-listed row
| $0.5850788$ | [S2026] | Used GPT 5.2. Discussed [here](https://www.erdosproblems.com/forum/thread/513#post-4532) |tracked since 2026-07-24 — no movement seen yet
Cite this rowBounds Ledger — Erdős maximum-term constant (51a)
upper bound: $\frac{2}{\pi}\approx 0.6366197724$ (tracked since 2026-07-24 — no movement seen yet)
lower bound: $0.5850788$ (tracked since 2026-07-24 — no movement seen yet)
Mirrored from teorth/optimizationproblems@2c1968c. These are the last-listed rows of that constant's bounds table — a listing position, not a statement that this bound is the strongest or most recent. A snapshot at that sha, not a live read.
https://u00dxk2.github.io/bounds-ledger/c/51a.html