Janko group

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Janko group may refer to any of the four sporadic groups named for Zvonimir Janko:

• Janko group J1, of order 175560
• Hall–Janko group, of order 604800, also known as HJ and J2
• Janko group J3, of order 50232960, also known as the Higman–Janko–McKay group
• Janko group J4, of order about 8×10¹⁹

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