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
686.2-a2
686.2-a
$2$
$2$
\(\Q(\sqrt{2}) \)
$2$
$[2, 0]$
686.2
\( 2 \cdot 7^{3} \)
\( 2^{5} \cdot 7^{11} \)
$1.29349$
$(a), (-2a+1), (2a+1)$
0
$\Z/2\Z$
$\textsf{no}$
$\mathrm{SU}(2)$
$2$
2B
$1$
\( 2^{2} \cdot 5 \)
$1$
$1.136251981$
2.008628703
\( \frac{199003633361573}{392} a + \frac{35179204742368}{49} \)
\( \bigl[1\) , \( a - 1\) , \( a + 1\) , \( -304 a - 646\) , \( -4930 a - 6831\bigr] \)
${y}^2+{x}{y}+\left(a+1\right){y}={x}^{3}+\left(a-1\right){x}^{2}+\left(-304a-646\right){x}-4930a-6831$
686.2-f2
686.2-f
$2$
$2$
\(\Q(\sqrt{2}) \)
$2$
$[2, 0]$
686.2
\( 2 \cdot 7^{3} \)
\( 2^{5} \cdot 7^{5} \)
$1.29349$
$(a), (-2a+1), (2a+1)$
0
$\Z/2\Z$
$\textsf{no}$
$\mathrm{SU}(2)$
$2$
2B
$1$
\( 2^{2} \)
$1$
$3.016296194$
1.066421746
\( \frac{199003633361573}{392} a + \frac{35179204742368}{49} \)
\( \bigl[1\) , \( a + 1\) , \( 0\) , \( 176 a - 256\) , \( -36 a + 32\bigr] \)
${y}^2+{x}{y}={x}^{3}+\left(a+1\right){x}^{2}+\left(176a-256\right){x}-36a+32$
4802.1-h2
4802.1-h
$2$
$2$
\(\Q(\sqrt{2}) \)
$2$
$[2, 0]$
4802.1
\( 2 \cdot 7^{4} \)
\( 2^{5} \cdot 7^{17} \)
$2.10397$
$(a), (-2a+1), (2a+1)$
0
$\Z/2\Z$
$\textsf{no}$
$\mathrm{SU}(2)$
$2$
2B
$1$
\( 2^{3} \)
$1$
$1.913340018$
1.352935701
\( \frac{199003633361573}{392} a + \frac{35179204742368}{49} \)
\( \bigl[1\) , \( -a\) , \( 1\) , \( 8583 a - 12602\) , \( 12978 a - 14330\bigr] \)
${y}^2+{x}{y}+{y}={x}^{3}-a{x}^{2}+\left(8583a-12602\right){x}+12978a-14330$
4802.1-m2
4802.1-m
$2$
$2$
\(\Q(\sqrt{2}) \)
$2$
$[2, 0]$
4802.1
\( 2 \cdot 7^{4} \)
\( 2^{5} \cdot 7^{11} \)
$2.10397$
$(a), (-2a+1), (2a+1)$
$1$
$\Z/2\Z$
$\textsf{no}$
$\mathrm{SU}(2)$
$2$
2B
$1$
\( 2^{3} \cdot 5 \)
$0.131830779$
$5.079155249$
4.734709196
\( \frac{199003633361573}{392} a + \frac{35179204742368}{49} \)
\( \bigl[a + 1\) , \( -a\) , \( a\) , \( 547 a - 914\) , \( 392 a + 72\bigr] \)
${y}^2+\left(a+1\right){x}{y}+a{y}={x}^{3}-a{x}^{2}+\left(547a-914\right){x}+392a+72$
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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.