PermutationGroup<21|
\[2,3,1,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21
],
\[1,2,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,3
]
/*order=2^17*3^9*5^4*7^3*11*13*17*19*/>
