## The modular curve $X_{187c}$

Curve name $X_{187c}$
Index $96$
Level $8$
Genus $0$
Does the subgroup contain $-I$? No
Generating matrices $\left[ \begin{matrix} 5 & 4 \\ 2 & 3 \end{matrix}\right], \left[ \begin{matrix} 1 & 4 \\ 0 & 5 \end{matrix}\right], \left[ \begin{matrix} 1 & 0 \\ 4 & 5 \end{matrix}\right], \left[ \begin{matrix} 3 & 4 \\ 6 & 1 \end{matrix}\right]$
Images in lower levels
 Level Index of image Corresponding curve $2$ $6$ $X_{8}$ $4$ $24$ $X_{58}$
Meaning/Special name
Chosen covering $X_{187}$
Curves that $X_{187c}$ minimally covers
Curves that minimally cover $X_{187c}$
Curves that minimally cover $X_{187c}$ and have infinitely many rational points.
Model $\mathbb{P}^{1}$, a universal elliptic curve over an appropriate base is given by $y^2 = x^3 + A(t)x + B(t), \text{ where}$ $A(t) = -27t^{32} - 5184t^{24} + 179712t^{16} - 1327104t^{8} - 1769472$ $B(t) = 54t^{48} - 31104t^{40} + 953856t^{32} - 244187136t^{16} + 2038431744t^{8} - 905969664$
Elliptic curve whose $2$-adic image is the subgroup $y^2 + xy + y = x^3 - x^2 - 2255x + 19622$, with conductor $225$
Generic density of odd order reductions $299/2688$