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Label Class Base field Conductor norm Rank Torsion CM Sato-Tate Regulator Period Leading coeff j-invariant Weierstrass coefficients Weierstrass equation
13.1-a2 13.1-a 5.5.36497.1 \( 13 \) 0 $\Z/2\Z$ $\mathrm{SU}(2)$ $1$ $568.2325455$ 1.48719366 \( \frac{1596793}{169} a^{4} - \frac{937970}{169} a^{3} - \frac{7191975}{169} a^{2} + \frac{918304}{169} a + \frac{2080992}{169} \) \( \bigl[a^{4} - 2 a^{3} - 3 a^{2} + 6 a + 1\) , \( -a^{2} + 2 a + 1\) , \( a^{2} - a - 2\) , \( 4 a^{4} - 6 a^{3} - 13 a^{2} + 10 a + 6\) , \( 5 a^{4} - 4 a^{3} - 19 a^{2} + 2 a + 3\bigr] \) ${y}^2+\left(a^{4}-2a^{3}-3a^{2}+6a+1\right){x}{y}+\left(a^{2}-a-2\right){y}={x}^{3}+\left(-a^{2}+2a+1\right){x}^{2}+\left(4a^{4}-6a^{3}-13a^{2}+10a+6\right){x}+5a^{4}-4a^{3}-19a^{2}+2a+3$
13.1-b2 13.1-b 5.5.36497.1 \( 13 \) $1$ $\Z/2\Z$ $\mathrm{SU}(2)$ $0.003887395$ $22493.89263$ 1.14428645 \( \frac{1596793}{169} a^{4} - \frac{937970}{169} a^{3} - \frac{7191975}{169} a^{2} + \frac{918304}{169} a + \frac{2080992}{169} \) \( \bigl[1\) , \( 2 a^{4} - 3 a^{3} - 7 a^{2} + 6 a + 2\) , \( 0\) , \( -2 a^{4} + 3 a^{3} + 7 a^{2} - 6 a - 3\) , \( 0\bigr] \) ${y}^2+{x}{y}={x}^{3}+\left(2a^{4}-3a^{3}-7a^{2}+6a+2\right){x}^{2}+\left(-2a^{4}+3a^{3}+7a^{2}-6a-3\right){x}$
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  *The rank, regulator and analytic order of Ш are not known for all curves in the database; curves for which these are unknown will not appear in searches specifying one of these quantities.