Elliott-Halberstam level-of-distribution exponent (66a)

Elliott-Halberstam level-of-distribution exponent

66a

Upper bound, last-listed row

| $1$ | | Trivial ceiling in the standard level-of-distribution formulation. |tracked since 2026-07-24 — no movement seen yet

Lower bound, last-listed row

| $1/2$ | [[Ked2007](#Ked2007)] | Bombieri-Vinogradov range $Q=x^{1/2}(\log x)^{-B}$. [Ked2007-BV] |

exact pinned row

| $1/2$ | [[Ked2007](#Ked2007)] | Bombieri-Vinogradov range $Q=x^{1/2}(\log x)^{-B}$. <a href="#Ked2007-BV">[Ked2007-BV]</a> |

tracked since 2026-07-24 — no movement seen yet

Cite this row

Bounds Ledger — Elliott-Halberstam level-of-distribution exponent (66a)
upper bound: $1$ (tracked since 2026-07-24 — no movement seen yet)
lower bound: $1/2$ (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/66a.html