| 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 |
| Level | Index of image | Corresponding curve |
| $2$ |
$6$ |
$X_{8}$ |
|
| 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 |
$1/14$ |