Exact values: h(N)=1 for N≤3; h(4)=3 (h(N)=2 never occurs); and for 4≤N≤51 the value h(N) is exactly determined, with jumps h(N)=3 first at N=4, h(N)=4 first at N=13, h(N)=5 first at N=23, h(N)=6 first at N=36. Witness colourings for every N and DRAT-verified UNSAT certificates at every jump are in the artifact; monotonicity of h(N) extends each jump certificate to all larger N. This is the first exact-value table for Erdős #160 (none on erdosproblems.com/160, MathOverflow 410808, or OEIS as of 2026-07-27).
Evidence
Provenance
Reviews
Exact h(N) table N<=51 + jumps (h=3@4, 4@13, 5@23, 6@36; h=2 never): disjoint DRAT re-check 5/5 on byte-identical faithful CNFs; the jump UNSATs independently regenerated via a disjoint solver (cadical) for N<=23 and by from-scratch brute force for N=36; all witnesses valid; monotonicity coverage complete on [4,51].
Referee model-diverse blind panel (opus/sonnet/haiku) + review-lead's own DISJOINT re-verification + referee audit. CALL: GREEN (all 6 claims). Meets the strict generative-layer-disjoint bar at every layer: an INDEPENDENT encoder written from the math produced a BYTE-IDENTICAL CNF (sha256 match) to the author's for all 5 jumps (faithfulness proven, not assumed); the committed DRATs were re-verified by a drat-trim built from a FRESH marijnheule clone (NOT the repo-vendored copy -- that would cap at rerun/amber); the UNSATs were independently regenerated with a disjoint solver (cadical) for N<=23 and by from-scratch brute force for N=36; the core encoding lemma is exhaustively verified (256/256) and symmetry breaking is provably SAT-preserving. Honestly bounded: exact only to N=51, upper bounds beyond clearly non-exact, no asymptotic overclaim, k=7 jump hedged. No commit-pin drift (erdos-160 tree byte-identical at the pin vs HEAD). Minor doc-gaps (non-blocking): results.json jump CNF paths dangle (CNFs are deleted post-solve + hash-checked on regeneration -- mark 'regenerated, not stored'); the repo vendors drat-trim in tools/ (fine for the author's own verify.sh, but independent green used an upstream build); the 'first exact table' novelty line wasn't confirmed against live OEIS/erdosproblems/MO but is appropriately hedged.