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
128.1-a3
128.1-a
$4$
$4$
\(\Q(\sqrt{2}) \)
$2$
$[2, 0]$
128.1
\( 2^{7} \)
\( 2^{14} \)
$0.85013$
$(a)$
0
$\Z/2\Z\oplus\Z/2\Z$
$\textsf{no}$
$\mathrm{SU}(2)$
✓
✓
$2$
2Cs
$1$
\( 2 \)
$1$
$22.17917604$
0.980190361
\( 10976 \)
\( \bigl[0\) , \( a - 1\) , \( 0\) , \( 4 a - 6\) , \( -10 a + 14\bigr] \)
${y}^2={x}^{3}+\left(a-1\right){x}^{2}+\left(4a-6\right){x}-10a+14$
128.1-b3
128.1-b
$4$
$4$
\(\Q(\sqrt{2}) \)
$2$
$[2, 0]$
128.1
\( 2^{7} \)
\( 2^{14} \)
$0.85013$
$(a)$
0
$\Z/2\Z\oplus\Z/2\Z$
$\textsf{no}$
$\mathrm{SU}(2)$
✓
✓
$2$
2Cs
$1$
\( 2 \)
$1$
$22.17917604$
0.980190361
\( 10976 \)
\( \bigl[0\) , \( -a + 1\) , \( 0\) , \( 4 a - 6\) , \( 10 a - 14\bigr] \)
${y}^2={x}^{3}+\left(-a+1\right){x}^{2}+\left(4a-6\right){x}+10a-14$
256.1-b3
256.1-b
$4$
$4$
\(\Q(\sqrt{2}) \)
$2$
$[2, 0]$
256.1
\( 2^{8} \)
\( 2^{14} \)
$1.01098$
$(a)$
0
$\Z/2\Z\oplus\Z/2\Z$
$\textsf{no}$
$\mathrm{SU}(2)$
✓
✓
✓
$2$
2Cs
$1$
\( 2^{2} \)
$1$
$15.09590514$
1.334302111
\( 10976 \)
\( \bigl[0\) , \( 1\) , \( 0\) , \( -2\) , \( -2\bigr] \)
${y}^2={x}^{3}+{x}^{2}-2{x}-2$
256.1-d3
256.1-d
$4$
$4$
\(\Q(\sqrt{2}) \)
$2$
$[2, 0]$
256.1
\( 2^{8} \)
\( 2^{14} \)
$1.01098$
$(a)$
$1$
$\Z/2\Z\oplus\Z/2\Z$
$\textsf{no}$
$\mathrm{SU}(2)$
✓
✓
✓
$2$
2Cs
$1$
\( 2^{2} \)
$0.216165582$
$32.58604536$
1.245211766
\( 10976 \)
\( \bigl[0\) , \( -1\) , \( 0\) , \( -2\) , \( 2\bigr] \)
${y}^2={x}^{3}-{x}^{2}-2{x}+2$
1024.1-g3
1024.1-g
$4$
$4$
\(\Q(\sqrt{2}) \)
$2$
$[2, 0]$
1024.1
\( 2^{10} \)
\( 2^{20} \)
$1.42974$
$(a)$
0
$\Z/2\Z\oplus\Z/2\Z$
$\textsf{no}$
$\mathrm{SU}(2)$
✓
✓
$2$
2Cs
$1$
\( 2^{2} \)
$1$
$15.68304578$
1.386198502
\( 10976 \)
\( \bigl[0\) , \( -a\) , \( 0\) , \( -4\) , \( 4 a\bigr] \)
${y}^2={x}^{3}-a{x}^{2}-4{x}+4a$
1024.1-h3
1024.1-h
$4$
$4$
\(\Q(\sqrt{2}) \)
$2$
$[2, 0]$
1024.1
\( 2^{10} \)
\( 2^{20} \)
$1.42974$
$(a)$
0
$\Z/2\Z\oplus\Z/2\Z$
$\textsf{no}$
$\mathrm{SU}(2)$
✓
✓
$2$
2Cs
$1$
\( 2^{2} \)
$1$
$10.67441689$
0.943494071
\( 10976 \)
\( \bigl[0\) , \( a - 1\) , \( 0\) , \( -10 a - 13\) , \( -19 a - 27\bigr] \)
${y}^2={x}^{3}+\left(a-1\right){x}^{2}+\left(-10a-13\right){x}-19a-27$
1024.1-i3
1024.1-i
$4$
$4$
\(\Q(\sqrt{2}) \)
$2$
$[2, 0]$
1024.1
\( 2^{10} \)
\( 2^{20} \)
$1.42974$
$(a)$
0
$\Z/2\Z\oplus\Z/2\Z$
$\textsf{no}$
$\mathrm{SU}(2)$
✓
✓
$2$
2Cs
$1$
\( 2^{2} \)
$1$
$15.68304578$
1.386198502
\( 10976 \)
\( \bigl[0\) , \( a\) , \( 0\) , \( -4\) , \( -4 a\bigr] \)
${y}^2={x}^{3}+a{x}^{2}-4{x}-4a$
1024.1-j3
1024.1-j
$4$
$4$
\(\Q(\sqrt{2}) \)
$2$
$[2, 0]$
1024.1
\( 2^{10} \)
\( 2^{20} \)
$1.42974$
$(a)$
0
$\Z/2\Z\oplus\Z/2\Z$
$\textsf{no}$
$\mathrm{SU}(2)$
✓
✓
$2$
2Cs
$1$
\( 2^{2} \)
$1$
$23.04181365$
2.036627835
\( 10976 \)
\( \bigl[0\) , \( -a + 1\) , \( 0\) , \( -10 a - 13\) , \( 19 a + 27\bigr] \)
${y}^2={x}^{3}+\left(-a+1\right){x}^{2}+\left(-10a-13\right){x}+19a+27$
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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.