I've recently been learning about 2-transitive permutation groups. To better my understanding of the classification of 2-transitive groups I'm trying to learn about 2-transitive permutation groups of small degree, say $ n \leq 30 $. To make this slightly more manageable I've confined myself to odd degree.
Is this the full list of 2-transitive permutation groups for odd degree $ n \leq 30 $ (excluding $ A_n,S_n $)? $ n $ is the degree $ k $ is the transitivity
| $n$ | $k$ | Group |
|---|---|---|
| 5 | 2 | $AGL(1,5)$ |
| 7 | 2 | $AGL(1,7)$ |
| 7 | 2 | $PSL(3,2)$ |
| 9 | 2 | $AGL(1,9)=3^2:8$ |
| 9 | 2 | $AGL(2,3)=3^2:2S_4$ |
| 9 | 2 | $ASL(2,3)=3^2:2A_4$ |
| 9 | 2 | $3^2:Q_8$ |
| 9 | 2 | $3^2:2D_8$ |
| 9 | 3 | $PSL(2,8)$ |
| 9 | 3 | $P\Gamma L(2,8)$ |
| 11 | 2 | $AGL(1,11)$ |
| 11 | 2 | $PSL(2,11)$ |
| 11 | 4 | $M_{11}$ |
| 13 | 2 | $AGL(1,13)$ |
| 13 | 2 | $PSL(3,3)$ |
| 15 | 2 | $PSL(4,2)\cong A_8$ |
| 15 | 2 | $A_7$ |
| 17 | 2 | $AGL(1,17)$ |
| 17 | 3 | $PSL(2,16)\leq G \leq P\Gamma L(2,16)$ (3 total) |
| 19 | 2 | $AGL(1,19)$ |
| 21 | 2 | $PSL(3,4)\leq G \leq P\Gamma L(3,4)$(4 total) |
| 23 | 2 | $AGL(1,23)$ |
| 23 | 4 | $M_{23}$ |
| 25 | 2 | $ASL(2,5)\leq G \leq A \Gamma L(2,5)$ (7 total) |
| 25 | 2 | $AGL(1,25)$ |
| 25 | 2 | $A\Gamma L(1,25)$ |
| 27 | 2 | $AGL(3,3)$ |
| 27 | 2 | $ASL(3,3)$ |
| 27 | 2 | $AGL(1,27)$ |
| 27 | 2 | $A\Gamma L(1,27)$ |
| 29 | 2 | $AGL(1,29)$ |
Edit: I updated the list using the answer/comments/GAP code from comments
Edit 2: reader beware I think I fixed the degree 27 groups but seems like my degree 25 groups still aren't right
No, these are not all. You are missing:
(The groups $\Gamma L$ arise by taking Galois automorphisms of SL in addition to GL.)