M_5 = 4.1622565831652779... reproduces the only other value known since 1984 (Goldstein-McDonald's Lambda_5 under the M_n convention). Its minimal polynomial is (PSLQ-recognized, 80-digit) 95486601852745 x^4 - 605014169885889 x^3 + 904976779994997 x^2 - 80594514797592 x - 374822538421107; residual/coeff-scale < 1e-30. PSLQ-recognized rather than symbolically eliminated (unlike M_3, M_4).
Evidence
Provenance
Reviews
M_5 matches own 30-digit recompute; residual 4e-60; PSLQ-not-eliminated disclosed.
Referee-commissioned independent blind review (Fable-5). Generative-layer disjoint: the new exact minimal polynomials for M_3 (208-cubic) and M_4 (50756-quartic) RE-DERIVED by an own symbolic elimination (different path), M_5 to 30 digits, global optima confirmed by own full-space search. 6/7 claims fully supported with honest scoping. Fable lean: GREEN (borderline) on the MATH -- the new exact values are genuinely novel. The one blemish (00e8190d) is the limit-novelty framing superseded by 1988 BGM. Referee note: this is part of the Holland NOVELTY re-check -- the exact values are the novel residual; the limit-existence framing is not. Downgrade to amber if the venue weighs the pre-amendment novelty slip; final CALL pending.