Finite Group DatabasebetaFinite Group Databasebeta| order | 640 |
| nilpotency class | 3 |
| isoclinism | isoclinic class of #3264 |
| automorphism | ? |
| homology | Abelianization (H1) = C24×C5 · Schur multiplier (H2) = C24 |
| direct product | C5×#3402 |
| subgroup | G/H | |
|---|---|---|
| center, socle | C22×C5 | C22×D4 |
| commutator, Frattini, cosocle | C2×C4 | C24×C5 |
| prime radical | C2×C5×D8 | C22 |
| LCS | G ▷ C2×C4 ▷ C2 ▷ C1 | |
| UCS | C1 ◁ C22×C5 ◁ C4×C5×Q8 ◁ G | |
356 conjugacy classes of subgroups.
| minimal degree | μ(G) = 29 |
| transitive degree | μt(G) = 320 |
A minimal faithful permutation representation — 4 generators on 29 points:
(1,2,3,4,5)(7,11)(12,13)(14,15,19,22)(16,23,24,29)(17,21,18,26)(20,27,28,25);(6,7,10,11)(8,12,9,13)(16,24)(20,28)(23,29)(25,27);(6,8,10,9)(7,12,11,13)(14,16)(15,20)(17,25)(18,27)(19,24)(21,29)(22,28)(23,26);(6,9,10,8)(7,12,11,13)(14,17,19,18)(15,21,22,26)(16,25,24,27)(20,29,28,23)145 conjugacy classes — view the full character table.
Construct this group in GAP via the SmallGroups library:
gap> SmallGroup(640, 19079);