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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
26.4-a1 26.4-a 4.4.9248.1 \( 2 \cdot 13 \) $1$ $\Z/2\Z$ $\mathrm{SU}(2)$ $0.235921893$ $129.3290458$ 3.807339941 \( \frac{13179827674651809978387}{38614472} a^{3} + \frac{28149201874182484162433}{38614472} a^{2} - \frac{5778658371471464319445}{38614472} a - \frac{12341938383390744470007}{38614472} \) \( \bigl[a^{3} - 4 a + 1\) , \( a^{3} - 5 a + 1\) , \( a^{2} + a - 3\) , \( -82 a^{3} - 185 a^{2} + 21 a + 87\) , \( 1241 a^{3} + 2655 a^{2} - 538 a - 1169\bigr] \) ${y}^2+\left(a^{3}-4a+1\right){x}{y}+\left(a^{2}+a-3\right){y}={x}^{3}+\left(a^{3}-5a+1\right){x}^{2}+\left(-82a^{3}-185a^{2}+21a+87\right){x}+1241a^{3}+2655a^{2}-538a-1169$
26.4-b1 26.4-b 4.4.9248.1 \( 2 \cdot 13 \) $1$ $\Z/2\Z$ $\mathrm{SU}(2)$ $1.048583304$ $14.24381837$ 1.863745901 \( \frac{13179827674651809978387}{38614472} a^{3} + \frac{28149201874182484162433}{38614472} a^{2} - \frac{5778658371471464319445}{38614472} a - \frac{12341938383390744470007}{38614472} \) \( \bigl[a + 1\) , \( a^{3} + a^{2} - 5 a - 4\) , \( 1\) , \( 92 a^{3} + 43 a^{2} - 427 a - 275\) , \( 353 a^{3} + 162 a^{2} - 1654 a - 1064\bigr] \) ${y}^2+\left(a+1\right){x}{y}+{y}={x}^{3}+\left(a^{3}+a^{2}-5a-4\right){x}^{2}+\left(92a^{3}+43a^{2}-427a-275\right){x}+353a^{3}+162a^{2}-1654a-1064$
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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.