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
81.1-a1
81.1-a
$8$
$30$
\(\Q(\sqrt{5}) \)
$2$
$[2, 0]$
81.1
\( 3^{4} \)
\( 3^{6} \)
$0.59944$
$(3)$
0
$\Z/6\Z$
$\textsf{potential}$
$-15$
$N(\mathrm{U}(1))$
✓
✓
$3$
3B.1.1
$1$
\( 2 \)
$1$
$23.62521625$
0.586973216
\( -85995 a - 52515 \)
\( \bigl[1\) , \( -1\) , \( \phi\) , \( -2 \phi\) , \( \phi\bigr] \)
${y}^2+{x}{y}+\phi{y}={x}^{3}-{x}^{2}-2\phi{x}+\phi$
81.1-a2
81.1-a
$8$
$30$
\(\Q(\sqrt{5}) \)
$2$
$[2, 0]$
81.1
\( 3^{4} \)
\( 3^{18} \)
$0.59944$
$(3)$
0
$\Z/2\Z$
$\textsf{potential}$
$-15$
$N(\mathrm{U}(1))$
✓
✓
$3$
3B.1.2
$1$
\( 2 \)
$1$
$2.625024027$
0.586973216
\( -85995 a - 52515 \)
\( \bigl[1\) , \( -1\) , \( \phi + 1\) , \( -14 \phi - 2\) , \( -21 \phi - 6\bigr] \)
${y}^2+{x}{y}+\left(\phi+1\right){y}={x}^{3}-{x}^{2}+\left(-14\phi-2\right){x}-21\phi-6$
2025.1-e1
2025.1-e
$8$
$30$
\(\Q(\sqrt{5}) \)
$2$
$[2, 0]$
2025.1
\( 3^{4} \cdot 5^{2} \)
\( 3^{6} \cdot 5^{6} \)
$1.34039$
$(-2a+1), (3)$
0
$\Z/2\Z$
$\textsf{potential}$
$-15$
$N(\mathrm{U}(1))$
✓
✓
$1$
\( 2^{2} \)
$1$
$3.521839301$
1.575014416
\( -85995 a - 52515 \)
\( \bigl[\phi\) , \( -\phi - 1\) , \( 0\) , \( -6 \phi + 6\) , \( -7 \phi + 10\bigr] \)
${y}^2+\phi{x}{y}={x}^{3}+\left(-\phi-1\right){x}^{2}+\left(-6\phi+6\right){x}-7\phi+10$
2025.1-e2
2025.1-e
$8$
$30$
\(\Q(\sqrt{5}) \)
$2$
$[2, 0]$
2025.1
\( 3^{4} \cdot 5^{2} \)
\( 3^{18} \cdot 5^{6} \)
$1.34039$
$(-2a+1), (3)$
0
$\Z/2\Z$
$\textsf{potential}$
$-15$
$N(\mathrm{U}(1))$
✓
✓
$1$
\( 2^{2} \)
$1$
$3.521839301$
1.575014416
\( -85995 a - 52515 \)
\( \bigl[\phi\) , \( -\phi - 1\) , \( 1\) , \( -59 \phi + 51\) , \( 253 \phi - 264\bigr] \)
${y}^2+\phi{x}{y}+{y}={x}^{3}+\left(-\phi-1\right){x}^{2}+\left(-59\phi+51\right){x}+253\phi-264$
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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.