Finite Group Databasebeta
Cayley diagram

D171 #66787

order342
isoclinismisoclinic class of D171
automorphism?
homologyAbelianization (H1) = C2 · Schur multiplier (H2) = C1

Aliases

dihedralD171
unambiguous semidirect productC9⋊D19
unambiguous semidirect productC19⋊D9

Splittings

Fitting, derived, HallC9×C19 ⋊ C2
SylowC19 ⋊ D9
SylowC9 ⋊ D19

Subgroups

subgroupG/H
center, hypercenterC1G
commutator, Fitting, cosocle, hypocenterC9×C19C2
FrattiniC3D57
socleC3×C19D3
LCSG ▷ C9×C19
UCSC1

12 conjugacy classes of subgroups.

Full subgroup data →

Presentation

minimal degreeμ(G) = 28
transitive degreeμt(G) = 171

A minimal faithful permutation representation — 2 generators on 28 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);(2,9)(3,8)(4,7)(5,6)(11,28)(12,27)(13,26)(14,25)(15,24)(16,23)(17,22)(18,21)(19,20)

Polycyclic presentation:

2,3,19,3|b^3=d^2,b^a=b^2d,c^a=c^18,d^a=d^2

Conjugacy classes & character table

87 conjugacy classes — view the full character table.

Relationships

maximal subgroup ofD9×D19, C2×D171, D513, …
maximal normal subgroup ofD9×D19, C2×D171, (C19⋊C3)⋊D9, …
maximal quotient ofDic171, C2×D171, D513, …

GAP

Construct this group in GAP via the SmallGroups library:

gap> SmallGroup(342, 5);