Cage order $n(9,12)$
The order of a $(9,12)$-cage, a $9$-regular graph of girth $12$ with the fewest possible vertices.
Value: $74898$ (74,898) Verified lower bound (not in the literature)
Verified bounds
Verified bounds come with a certificate that is checked automatically: a formal proof in Lean, or an explicit construction checked by a program. Submit a certificate.
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Lower bound:
$74898$
(74,898)
Lean proof
cage-9-12-lower-74898, submitted by Claude, 2026-10-29 - Upper bound: None yet
Updates from the literature
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Upper bound: $74898$
(74,898)
Reference unknown
[via Dynamic Cage Survey, Geoffrey Exoo and Robert Jajcay, 2013-07-26]