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
20.1-a9
20.1-a
$12$
$24$
3.3.148.1
$3$
$[3, 0]$
20.1
\( 2^{2} \cdot 5 \)
\( 2^{8} \cdot 5^{2} \)
$1.79105$
$(a^2-a-2), (a^2-a-1)$
0
$\Z/2\Z\oplus\Z/6\Z$
$\textsf{no}$
$\mathrm{SU}(2)$
$2, 3$
2Cs , 3B.1.1
$1$
\( 2 \cdot 3 \)
$1$
$224.9714518$
0.770522476
\( -\frac{108768}{25} a^{2} + \frac{75424}{25} a + \frac{407296}{25} \)
\( \bigl[a^{2} - 1\) , \( a^{2} - 3\) , \( 0\) , \( -625 a^{2} - 730 a + 290\) , \( -9146 a^{2} - 10702 a + 4214\bigr] \)
${y}^2+\left(a^{2}-1\right){x}{y}={x}^{3}+\left(a^{2}-3\right){x}^{2}+\left(-625a^{2}-730a+290\right){x}-9146a^{2}-10702a+4214$
80.1-b1
80.1-b
$12$
$24$
3.3.148.1
$3$
$[3, 0]$
80.1
\( 2^{4} \cdot 5 \)
\( 2^{8} \cdot 5^{2} \)
$2.25658$
$(a^2-a-2), (a^2-a-1)$
0
$\Z/2\Z\oplus\Z/4\Z$
$\textsf{no}$
$\mathrm{SU}(2)$
$2, 3$
2Cs , 3B
$1$
\( 2^{2} \)
$1$
$226.7568548$
1.164956165
\( -\frac{108768}{25} a^{2} + \frac{75424}{25} a + \frac{407296}{25} \)
\( \bigl[a^{2} - 1\) , \( -a^{2} + 2 a + 2\) , \( 0\) , \( -4591 a^{2} - 5372 a + 2118\) , \( 152788 a^{2} + 178776 a - 70406\bigr] \)
${y}^2+\left(a^{2}-1\right){x}{y}={x}^{3}+\left(-a^{2}+2a+2\right){x}^{2}+\left(-4591a^{2}-5372a+2118\right){x}+152788a^{2}+178776a-70406$
100.2-a11
100.2-a
$12$
$24$
3.3.148.1
$3$
$[3, 0]$
100.2
\( 2^{2} \cdot 5^{2} \)
\( 2^{8} \cdot 5^{8} \)
$2.34209$
$(a^2-a-2), (a^2-a-1)$
0
$\Z/2\Z\oplus\Z/2\Z$
$\textsf{no}$
$\mathrm{SU}(2)$
$2, 3$
2Cs , 3B
$1$
\( 2^{2} \)
$1$
$56.73514216$
1.165899989
\( -\frac{108768}{25} a^{2} + \frac{75424}{25} a + \frac{407296}{25} \)
\( \bigl[a^{2} - 1\) , \( -a^{2} + 2 a + 3\) , \( 0\) , \( -6979 a^{2} - 8164 a + 3220\) , \( -314976 a^{2} - 368548 a + 145146\bigr] \)
${y}^2+\left(a^{2}-1\right){x}{y}={x}^{3}+\left(-a^{2}+2a+3\right){x}^{2}+\left(-6979a^{2}-8164a+3220\right){x}-314976a^{2}-368548a+145146$
400.2-e1
400.2-e
$12$
$24$
3.3.148.1
$3$
$[3, 0]$
400.2
\( 2^{4} \cdot 5^{2} \)
\( 2^{8} \cdot 5^{8} \)
$2.95084$
$(a^2-a-2), (a^2-a-1)$
$1$
$\Z/2\Z\oplus\Z/2\Z$
$\textsf{no}$
$\mathrm{SU}(2)$
$2, 3$
2Cs , 3B
$1$
\( 2^{3} \)
$0.259152197$
$75.70894508$
2.419148294
\( -\frac{108768}{25} a^{2} + \frac{75424}{25} a + \frac{407296}{25} \)
\( \bigl[a^{2} - 1\) , \( a^{2} - 2 a - 1\) , \( a^{2} - 1\) , \( -51231 a^{2} - 59948 a + 23609\) , \( 5934968 a^{2} + 6944424 a - 2734899\bigr] \)
${y}^2+\left(a^{2}-1\right){x}{y}+\left(a^{2}-1\right){y}={x}^{3}+\left(a^{2}-2a-1\right){x}^{2}+\left(-51231a^{2}-59948a+23609\right){x}+5934968a^{2}+6944424a-2734899$
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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.