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In mathematics, O'Nan's group, denoted O'N, is the sporadic group of order 460 815 505 920 = 2 · 3 · 5 · 7 · 11 · 19 · 31.
He was named in honor of the mathematician Michael O'Nan (de) who discovered him.
The O'Nan group is part of the Rudvalis Group, the Lyons Group and the three groups of Janko J1, J3 and J4, of the six sporadic groups that are called the outcasts because they are not sub-quotients of the Monstre group.
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