Groups up to isomorphism
95378
Known bounds for the number of groups of a given order.
59138
Subgroups of $S_4$ isomorpic to $S_2$
41231
Subgroups of (Z,+) of order n
146969
Proving that every group of order $4$ is isomorphic to $\Bbb Z_4$ or $\Bbb Z^*_8$
54082
Group with exactly two subgroups of index 2
62017
Distinct Sylow P subgroups
141379
All groups where underlying set has at most 4 elements
55778
Group theoretic meaning of natural isomorphisms between certain functors
8746
Groups of order $pq$ without using Sylow theorems
90256
Example of a simple graph isomorphic to a permutation group.
124933
Isometry group question
139835
Every Finite Group is Isomorphic to a Subgroup of $A_n$
80381
Groups with "few" subgroups
6385
Minimal counterexamples of the isomorphism problem for integral group rings
99538
Non-trivial groups pairwise non-isomorphic with isomorphic direct products
126930
Finding all group homomorphisms of $S_n\to\mathbb{C}^*$ and $A_n\to\mathbb{C}^*$
38153
Looking for a simple proof that groups of order $2p$ are up to isomorphism $\mathbb{Z}_{2p}$ and $D_{p}$ .