Properties

Label 1.421.an
Base Field $\F_{421}$
Dimension $1$
Ordinary Yes
$p$-rank $1$
Principally polarizable Yes
Contains a Jacobian Yes

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Invariants

Base field:  $\F_{421}$
Dimension:  $1$
L-polynomial:  $1 - 13 x + 421 x^{2}$
Frobenius angles:  $\pm0.397394746907$
Angle rank:  $1$ (numerical)
Number field:  \(\Q(\sqrt{-1515}) \)
Galois group:  $C_2$
Jacobians:  12

This isogeny class is simple and geometrically simple.

Newton polygon

This isogeny class is ordinary.

$p$-rank:  $1$
Slopes:  $[0, 1]$

Point counts

This isogeny class contains the Jacobians of 12 curves, and hence is principally polarizable:

Point counts of the abelian variety

$r$ 1 2 3 4 5 6 7 8 9 10
$A(\F_{q^r})$ 409 177915 74632684 31414273635 13225443378829 5567914668980160 2344092100335740569 986862773296649202915 415469227535211611518204 174912544792426995990937875

Point counts of the curve

$r$ 1 2 3 4 5 6 7 8 9 10
$C(\F_{q^r})$ 409 177915 74632684 31414273635 13225443378829 5567914668980160 2344092100335740569 986862773296649202915 415469227535211611518204 174912544792426995990937875

Decomposition and endomorphism algebra

Endomorphism algebra over $\F_{421}$
The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-1515}) \).
All geometric endomorphisms are defined over $\F_{421}$.

Base change

This is a primitive isogeny class.

Twists

Below is a list of all twists of this isogeny class.
TwistExtension DegreeCommon base change
1.421.n$2$(not in LMFDB)