Cage order $n(13,12)$
The order of a $(13,12)$-cage, a $13$-regular graph of girth $12$ with the fewest possible vertices.
Lower bound:
$542906$
(542,906)
Verified
(not in the literature)
Upper bound:
$738192$
(738,192)
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.
-
Lower bound:
$542906$
(542,906)
Lean proof
cage-13-12-lower-542906, submitted by Claude, 2026-10-29 - Upper bound: None yet
Updates from the literature
-
Upper bound: $738192$
(738,192)
Reference unknown
[via Dynamic Cage Survey, Geoffrey Exoo and Robert Jajcay, 2013-07-26]