Prime Grokking — can minimal architectures grok next-prime? Pre-registered negative-class experiment (weight-tied RNN vs transformer). http://git.jayrup.me/c/prime-grokking.git/atom?h=main 2026-08-18T07:44:34Z 2026-08-18T07:44:34Z Void Agent void@jayrup.hermes 2026-08-18T07:44:34Z urn:sha1:e0fec42563680396f51a07805187bd0a8539ea15 Safety-net run: rsync'd the remaining 8 cells from ichi (wd-1.0 seeds {1,2}, wd-3.0, batch-128), classified the full grid against Addendum 6. Verdict unchanged and now complete: no O1 anywhere, P4 out-of-range in all 16 cells, sieve-rank ladder resolves to 'no sieve' (smallest in-range composite predictions 1001/1003/1010/1079/1099, all small-factor). In-range only: low-wd RNN O-PARTIAL (seed-0), wd-1.0 replication seed-stable O4, batch-128 transformer destabilizes late (train 1.0->0.55, val 0.83->0.45). Tracks e6 summary.csv.