Finding the number of normal subgroups of this group which has order 21
75590
How many normal subgroups does a non-abelian group $G$ of order $ 21$
65926
Group of order $1575$ having a normal sylow $3$ subgroup is abelian.
97928
Normal subgroup of a normal subgroup
22444
Normal subgroups of dihedral groups
50762
If $S_n$ has cyclic subgroups of these orders or not?
99114
Subgroups of index 3 are normal
129157
An exercise on isomorphic groups of order 24
3439
Other proofs that subgroups of $A_5$ have order at most 12
96614
Finite number of subgroups $\Rightarrow$  finite group
43651
Normal subgroups and factor groups
122959
How is number of conjugacy class related to the order of a group?
1360
Every group of order $150$ has a normal subgroup of order $25$
15526
Question on groups of order $pq$
141458
How many subgroups or order 8 an abelian Group of order 72 can have
72048
Finding Sylow 2-subgroups of the dihedral group $D_n$
75670
Questions around the number of subgroups of a $p$-group
91772
Proving that $A_n$ is the only proper nontrivial normal subgroup of $S_n$, $n\geq 5$