Hall–Janko graph
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In graph theory, the Hall–Janko graph, also known as the Hall-Janko-Wales graph, is a strongly regular graph with parameters (100,36,14,12) and a maximum coclique of size 10. Uniqueness of the paramater set is unknown. The Hall-Janko graph was originally constructed by D. Wales to establish the existence of the Hall-Janko group as an index 2 subgroup of its automorphism group.