| Curve name |
$X_{121a}$ |
| Index |
$48$ |
| Level |
$16$ |
| Genus |
$0$ |
| Does the subgroup contain $-I$? |
No |
| Generating matrices |
$
\left[ \begin{matrix} 1 & 1 \\ 8 & 1 \end{matrix}\right],
\left[ \begin{matrix} 7 & 7 \\ 8 & 3 \end{matrix}\right],
\left[ \begin{matrix} 5 & 0 \\ 8 & 5 \end{matrix}\right],
\left[ \begin{matrix} 5 & 0 \\ 8 & 3 \end{matrix}\right]$ |
| Images in lower levels |
|
| Meaning/Special name |
|
| Chosen covering |
$X_{121}$ |
| Curves that $X_{121a}$ minimally covers |
|
| Curves that minimally cover $X_{121a}$ |
|
| Curves that minimally cover $X_{121a}$ and have infinitely many rational
points. |
|
| Model |
$\mathbb{P}^{1}$, a universal elliptic curve over an appropriate base is
given by
\[y^2 = x^3 + A(t)x + B(t), \text{ where}\]
\[A(t) = -108t^{8} - 864t^{6} - 2160t^{4} - 1728t^{2} - 108\]
\[B(t) = -432t^{12} - 5184t^{10} - 23328t^{8} - 48384t^{6} - 44712t^{4} -
12960t^{2} + 432\]
|
| Info about rational points |
| Comments on finding rational points |
None |
| Elliptic curve whose $2$-adic image is the subgroup |
$y^2 = x^3 + x^2 - 61x - 205$, with conductor $960$ |
| Generic density of odd order reductions |
$635/5376$ |