## The modular curve $X_{243a}$

Curve name $X_{243a}$
Index $96$
Level $32$
Genus $0$
Does the subgroup contain $-I$? No
Generating matrices $\left[ \begin{matrix} 1 & 0 \\ 16 & 3 \end{matrix}\right], \left[ \begin{matrix} 3 & 3 \\ 16 & 3 \end{matrix}\right], \left[ \begin{matrix} 7 & 0 \\ 16 & 1 \end{matrix}\right], \left[ \begin{matrix} 5 & 0 \\ 16 & 5 \end{matrix}\right]$
Images in lower levels
 Level Index of image Corresponding curve $2$ $3$ $X_{6}$ $4$ $6$ $X_{13}$ $8$ $24$ $X_{36e}$ $16$ $48$ $X_{118e}$
Meaning/Special name
Chosen covering $X_{243}$
Curves that $X_{243a}$ minimally covers
Curves that minimally cover $X_{243a}$
Curves that minimally cover $X_{243a}$ and have infinitely many rational points.
Model $\mathbb{P}^{1}$, a universal elliptic curve over an appropriate base is given by $y^2 = x^3 + A(t)x + B(t), \text{ where}$ $A(t) = -108t^{32} + 1944t^{24} - 5292t^{16} + 5184t^{8} - 1728$ $B(t) = -432t^{48} - 11664t^{40} + 79056t^{32} - 190512t^{24} + 220320t^{16} - 124416t^{8} + 27648$
Elliptic curve whose $2$-adic image is the subgroup $y^2 + xy = x^3 + x^2 - 37596406375x - 2829050296195625$, with conductor $252150$
Generic density of odd order reductions $51/448$