| Curve name |
$X_{285}$ |
| Index |
$48$ |
| Level |
$16$ |
| Genus |
$1$ |
| Does the subgroup contain $-I$? |
Yes |
| Generating matrices |
$
\left[ \begin{matrix} 9 & 0 \\ 0 & 1 \end{matrix}\right],
\left[ \begin{matrix} 9 & 2 \\ 2 & 7 \end{matrix}\right],
\left[ \begin{matrix} 3 & 3 \\ 4 & 1 \end{matrix}\right],
\left[ \begin{matrix} 5 & 15 \\ 4 & 3 \end{matrix}\right]$ |
| Images in lower levels |
|
| Meaning/Special name |
|
| Chosen covering |
$X_{90}$ |
| Curves that $X_{285}$ minimally covers |
$X_{90}$ |
| Curves that minimally cover $X_{285}$ |
$X_{546}$, $X_{579}$, $X_{584}$, $X_{601}$ |
| Curves that minimally cover $X_{285}$ and have infinitely many rational
points. |
|
| Model |
\[y^2 = x^3 + x\] |
| Info about rational points |
| Rational point | Image on the $j$-line |
| $(0 : 1 : 0)$ |
\[54000 \,\,(\text{CM by }-12)\]
|
| $(0 : 0 : 1)$ |
\[54000 \,\,(\text{CM by }-12)\]
|
|
| Comments on finding rational points |
None |
| Elliptic curve whose $2$-adic image is the subgroup |
None |
| Generic density of odd order reductions |
N/A |