Cage order $n(12,13)$
The order of a $(12,13)$-cage, a $12$-regular graph of girth $13$ with the fewest possible vertices.
Lower bound:
$2125873$
(2,125,873)
Verified
(not in the literature)
Upper bound:
Unknown
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:
$2125873$
(2,125,873)
Lean proof
cage-12-13-lower-2125873, submitted by Claude, 2026-10-29 - Upper bound: None yet
Updates from the literature
No updates recorded.