The Janko group 
is the largest of the four Janko groups. It is a
sporadic group and simple
group of group order 
(Conway et al. 1985).
The group is implemented in the Wolfram Language as JankoGroupJ4[].
Janko Group J4
See also
Janko Groups, Simple Group, Sporadic GroupExplore with Wolfram|Alpha
References
Conway, J. H.; Curtis, R. T.; Norton, S. P.; Parker, R. A.; and Wilson, R. A. Atlas of Finite Groups: Maximal Subgroups and Ordinary Characters for Simple Groups. Oxford, England: Clarendon Press, 1985.Ivanov, A. A. and Meierfrankenfeld, U. "A Computer-Free Construction of
." J. Algebra 219, 113-172, 1999.Wilson,
R. A. "ATLAS: Janko Group 
." https://brauer.maths.qmul.ac.uk/Atlas/v3/spor/J4/.Referenced on Wolfram|Alpha
Janko Group J4Cite this as:
Weisstein, Eric W. "Janko Group J4." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/JankoGroupJ4.html