Properties

Label 1.421.an
Base field $\F_{421}$
Dimension $1$
$p$-rank $1$
Ordinary yes
Supersingular no
Simple yes
Geometrically simple yes
Primitive yes
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, primitive, ordinary, and not supersingular. It is principally polarizable and contains a Jacobian.

Newton polygon

This isogeny class is ordinary.

$p$-rank:  $1$
Slopes:  $[0, 1]$

Point counts

Point counts of the abelian variety

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $409$ $177915$ $74632684$ $31414273635$ $13225443378829$

Point counts of the curve

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

Jacobians and polarizations

This isogeny class contains the Jacobians of 12 curves (of which all are hyperelliptic), and hence is principally polarizable:

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{421}$.

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

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)