Finite Group Databasebeta

D7821 #30627705

order15642
automorphism?
homologyAbelianization (H1) = C2 · Schur multiplier (H2) = C1

Aliases

dihedralD7821
unambiguous semidirect productC9⋊D869
unambiguous semidirect productC11⋊D711
unambiguous semidirect productC79⋊D99

Splittings

Fitting, derived, HallC9×C11×C79 ⋊ C2
HallC11×C79 ⋊ D9
HallC9×C79 ⋊ D11
HallC9×C11 ⋊ D79
SylowC79 ⋊ D99
SylowC11 ⋊ D711
SylowC9 ⋊ D869

Subgroups

subgroupG/H
center, hypercenterC1G
commutator, Fitting, cosocle, hypocenterC9×C11×C79C2
FrattiniC3D2607
socleC3×C11×C79D3
LCSG ▷ C9×C11×C79
UCSC1

24 conjugacy classes of subgroups.

Full subgroup data →

Presentation

minimal degreeμ(G) = 99
transitive degreeμt(G) = 7821

A minimal faithful permutation representation — 2 generators on 99 points:

(1,2,3,4,5,6,7,8,9)(10,11,12,13,14,15,16,17,18,19,20)(21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99);(2,9)(3,8)(4,7)(5,6)(11,20)(12,19)(13,18)(14,17)(15,16)(22,99)(23,98)(24,97)(25,96)(26,95)(27,94)(28,93)(29,92)(30,91)(31,90)(32,89)(33,88)(34,87)(35,86)(36,85)(37,84)(38,83)(39,82)(40,81)(41,80)(42,79)(43,78)(44,77)(45,76)(46,75)(47,74)(48,73)(49,72)(50,71)(51,70)(52,69)(53,68)(54,67)(55,66)(56,65)(57,64)(58,63)(59,62)(60,61)

Polycyclic presentation:

2,3,11,79,3|b^3=e^2,b^a=b^2e,c^a=c^10,d^a=d^78,e^a=e^2

Conjugacy classes & character table

3912 conjugacy classes. The character table is too large to display.

Relationships

maximal subgroup ofD79×D99, D11×D711, D9×D869, …
maximal normal subgroup ofD79×D99, D11×D711, D9×D869, …
maximal quotient ofDic7821, C2×D7821, D23463

GAP

Construct this group in GAP via the SmallGroups library:

gap> SmallGroup(15642, 9);