Johnson graph $J(21,3)$

Number of vertices:$1330$
Diameter:$3$
Intersection array:$\{54,34,16;1,4,9\}$
Spectrum:$54^1 33^{20} 14^{189} (-3)^{1120}$
Automorphism group:$S_{21}$
Distance-transitive:Yes
Primitive




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Last updated: 22 April 2024