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
65536.1-d2
65536.1-d
$2$
$2$
\(\Q(\sqrt{-3}) \)
$2$
$[0, 1]$
65536.1
\( 2^{16} \)
\( 2^{18} \)
$2.47639$
$(2)$
$1$
$\Z/2\Z$
$\textsf{potential}$
$-4$
$N(\mathrm{U}(1))$
✓
✓
✓
$1$
\( 2 \)
$0.714741348$
$4.861490513$
4.012247529
\( 1728 \)
\( \bigl[0\) , \( 0\) , \( 0\) , \( -2 a\) , \( 0\bigr] \)
${y}^2={x}^{3}-2a{x}$
4096.1-CMc1
4096.1-CMc
$1$
$1$
\(\Q(\sqrt{-1}) \)
$2$
$[0, 1]$
4096.1
\( 2^{12} \)
\( 2^{18} \)
$1.42974$
$(a+1)$
0
$\Z/2\Z$
$\textsf{yes}$
$-4$
$\mathrm{U}(1)$
✓
✓
✓
$1$
\( 2 \)
$1$
$4.861490513$
2.430745256
\( 1728 \)
\( \bigl[0\) , \( 0\) , \( 0\) , \( 2\) , \( 0\bigr] \)
${y}^2={x}^{3}+2{x}$
1024.1-b2
1024.1-b
$4$
$4$
\(\Q(\sqrt{-2}) \)
$2$
$[0, 1]$
1024.1
\( 2^{10} \)
\( 2^{18} \)
$1.42974$
$(a)$
$1$
$\Z/2\Z\oplus\Z/2\Z$
$\textsf{potential}$
$-4$
$N(\mathrm{U}(1))$
✓
✓
✓
$2$
2Cs
$1$
\( 2^{2} \)
$1.217418063$
$4.861490513$
2.092493851
\( 1728 \)
\( \bigl[0\) , \( 0\) , \( 0\) , \( 2\) , \( 0\bigr] \)
${y}^2={x}^{3}+2{x}$
1024.1-k3
1024.1-k
$8$
$16$
\(\Q(\sqrt{2}) \)
$2$
$[2, 0]$
1024.1
\( 2^{10} \)
\( 2^{18} \)
$1.42974$
$(a)$
$1$
$\Z/2\Z$
$\textsf{potential}$
$-4$
$N(\mathrm{U}(1))$
✓
✓
✓
$1$
\( 2^{2} \)
$0.304354515$
$9.722981027$
2.092493851
\( 1728 \)
\( \bigl[0\) , \( 0\) , \( 0\) , \( 2\) , \( 0\bigr] \)
${y}^2={x}^{3}+2{x}$
4096.1-j2
4096.1-j
$2$
$2$
\(\Q(\sqrt{3}) \)
$2$
$[2, 0]$
4096.1
\( 2^{12} \)
\( 2^{18} \)
$2.47639$
$(a+1)$
$1$
$\Z/2\Z$
$\textsf{potential}$
$-4$
$N(\mathrm{U}(1))$
✓
✓
✓
$1$
\( 2^{2} \)
$0.714741348$
$9.722981027$
4.012247529
\( 1728 \)
\( \bigl[0\) , \( 0\) , \( 0\) , \( 2\) , \( 0\bigr] \)
${y}^2={x}^{3}+2{x}$
256.1-e7
256.1-e
$8$
$16$
\(\Q(\zeta_{16})^+\)
$4$
$[4, 0]$
256.1
\( 2^{8} \)
\( 2^{12} \)
$8.08786$
$(a)$
$1$
$\Z/2\Z$
$\textsf{potential}$
$-4$
$N(\mathrm{U}(1))$
✓
✓
✓
$1$
\( 1 \)
$0.304354515$
$378.1454402$
2.543159752
\( 1728 \)
\( \bigl[a^{3} - 2 a\) , \( a^{2} - 3\) , \( a^{3} - 2 a\) , \( -a^{2} + 2\) , \( -1\bigr] \)
${y}^2+\left(a^{3}-2a\right){x}{y}+\left(a^{3}-2a\right){y}={x}^{3}+\left(a^{2}-3\right){x}^{2}+\left(-a^{2}+2\right){x}-1$
32.1-a5
32.1-a
$8$
$16$
\(\Q(\sqrt{4 + \sqrt{2}})\)
$4$
$[4, 0]$
32.1
\( 2^{5} \)
\( 2^{12} \)
$16.50047$
$(a-2)$
$1$
$\Z/2\Z$
$\textsf{potential}$
$-4$
$N(\mathrm{U}(1))$
✓
✓
✓
$1$
\( 2^{2} \)
$0.304354515$
$378.1454402$
3.844896143
\( 1728 \)
\( \bigl[a^{3} - 4 a\) , \( a^{2} - 3\) , \( 0\) , \( 3 a^{2} - 7\) , \( 2 a^{2} - 5\bigr] \)
${y}^2+\left(a^{3}-4a\right){x}{y}={x}^{3}+\left(a^{2}-3\right){x}^{2}+\left(3a^{2}-7\right){x}+2a^{2}-5$
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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.