Hall-Janko near octagon from $J_2.2 \cong$ Cohen-Tits near octagon

Number of vertices: $315$
Diameter:$4$
Intersection array:$\{10,8,8,2;1,1,4,5\}$
Spectrum:$10^1 5^{36} (-2)^{160} 3^{90} (-5)^{28}$
Automorphism group:$J_2.2$
Distance-transitive:Yes
Primitive

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Last updated: 28 February 2024