| Curve name |
$X_{221a}$ |
| Index |
$96$ |
| Level |
$16$ |
| Genus |
$0$ |
| Does the subgroup contain $-I$? |
No |
| Generating matrices |
$
\left[ \begin{matrix} 9 & 9 \\ 12 & 3 \end{matrix}\right],
\left[ \begin{matrix} 5 & 10 \\ 0 & 1 \end{matrix}\right],
\left[ \begin{matrix} 13 & 10 \\ 4 & 1 \end{matrix}\right]$ |
| Images in lower levels |
|
| Meaning/Special name |
|
| Chosen covering |
$X_{221}$ |
| Curves that $X_{221a}$ minimally covers |
|
| Curves that minimally cover $X_{221a}$ |
|
| Curves that minimally cover $X_{221a}$ and have infinitely many rational
points. |
|
| Model |
$\mathbb{P}^{1}$, a universal elliptic curve over an appropriate base is
given by
\[y^2 = x^3 + A(t)x + B(t), \text{ where}\]
\[A(t) = -27t^{16} + 6048t^{8} - 6912\]
\[B(t) = 54t^{24} + 28512t^{16} - 456192t^{8} - 221184\]
|
| Info about rational points |
| Comments on finding rational points |
None |
| Elliptic curve whose $2$-adic image is the subgroup |
$y^2 + xy + y = x^3 - x^2 - x - 14$, with conductor $17$ |
| Generic density of odd order reductions |
$9827/86016$ |