Label
Class
Class size
Class degree
Base field
Field degree
Field signature
Conductor
Conductor norm
Discriminant norm
Root analytic conductor
Bad primes
Rank
Torsion
CM
CM
Sato-Tate
$\Q$-curve
Base change
Semistable
Potentially good
Nonmax $\ell$
mod-$\ell$ images
$Ш_{\textrm{an}}$
Tamagawa
Regulator
Period
Leading coeff
j-invariant
Weierstrass coefficients
Weierstrass equation
31.2-a2
31.2-a
$6$
$8$
\(\Q(\zeta_{15})^+\)
$4$
$[4, 0]$
31.2
\( 31 \)
\( 31^{4} \)
$4.60400$
$(-a^3+5a-2)$
0
$\Z/4\Z$
$\textsf{no}$
$\mathrm{SU}(2)$
✓
$2$
2B
$1$
\( 2 \)
$1$
$226.2402485$
0.843147624
\( -\frac{29296819153015039230435114609}{923521} a^{3} - \frac{9909977575470350951831216400}{923521} a^{2} + \frac{103925138003905943940922438084}{923521} a + \frac{21891704604902707693397138361}{923521} \)
\( \bigl[a + 1\) , \( a^{3} - 3 a\) , \( a^{2} - 1\) , \( 270 a^{3} - 70 a^{2} - 655 a - 231\) , \( -2943 a^{3} + 1542 a^{2} + 6186 a + 1507\bigr] \)
${y}^2+\left(a+1\right){x}{y}+\left(a^{2}-1\right){y}={x}^{3}+\left(a^{3}-3a\right){x}^{2}+\left(270a^{3}-70a^{2}-655a-231\right){x}-2943a^{3}+1542a^{2}+6186a+1507$
31.2-b1
31.2-b
$6$
$8$
\(\Q(\zeta_{15})^+\)
$4$
$[4, 0]$
31.2
\( 31 \)
\( 31^{4} \)
$4.60400$
$(-a^3+5a-2)$
0
$\Z/2\Z$
$\textsf{no}$
$\mathrm{SU}(2)$
✓
$2$
2B
$16$
\( 2 \)
$1$
$2.959428063$
0.705864781
\( -\frac{29296819153015039230435114609}{923521} a^{3} - \frac{9909977575470350951831216400}{923521} a^{2} + \frac{103925138003905943940922438084}{923521} a + \frac{21891704604902707693397138361}{923521} \)
\( \bigl[a^{3} - 2 a + 1\) , \( a^{3} - a^{2} - 2 a + 2\) , \( a^{2} - 1\) , \( 416 a^{3} + 76 a^{2} - 1585 a - 348\) , \( 6396 a^{3} + 1587 a^{2} - 23865 a - 5050\bigr] \)
${y}^2+\left(a^{3}-2a+1\right){x}{y}+\left(a^{2}-1\right){y}={x}^{3}+\left(a^{3}-a^{2}-2a+2\right){x}^{2}+\left(416a^{3}+76a^{2}-1585a-348\right){x}+6396a^{3}+1587a^{2}-23865a-5050$
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Pari/GP
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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.