Curve name  $X_{25n}$  
Index  $24$  
Level  $4$  
Genus  $0$  
Does the subgroup contain $I$?  No  
Generating matrices  $ \left[ \begin{matrix} 3 & 0 \\ 0 & 1 \end{matrix}\right], \left[ \begin{matrix} 1 & 2 \\ 0 & 1 \end{matrix}\right]$  
Images in lower levels 


Meaning/Special name  $X_1(2,4)$  
Chosen covering  $X_{25}$  
Curves that $X_{25n}$ minimally covers  
Curves that minimally cover $X_{25n}$  
Curves that minimally cover $X_{25n}$ and have infinitely many rational points.  
Model  $\mathbb{P}^{1}$, a universal elliptic curve over an appropriate base is given by \[y^2 = x^3 + A(t)x + B(t), \text{ where}\] \[A(t) = 27t^{4} + 27t^{2}  27\] \[B(t) = 54t^{6}  81t^{4}  81t^{2} + 54\]  
Info about rational points  
Comments on finding rational points  None  
Elliptic curve whose $2$adic image is the subgroup  $y^2 + xy + y = x^3 + x^2  39x + 36$, with conductor $231$  
Generic density of odd order reductions  $1/14$ 