Abelian variety isogeny class 1.331.aba over $\F_{331}$

• Label: 1.331.aba
• Base field: $\F_{331}$
• Dimension: $1$
• $p$-rank: $1$
• Ordinary: yes
• Supersingular: no
• Simple: yes
• Geometrically simple: yes
• Primitive: yes
• Principally polarizable: yes
• Contains a Jacobian: yes

Invariants

Base field:	$\F_{331}$
Dimension:	$1$
L-polynomial:	$1 - 26 x + 331 x^{2}$
Frobenius angles:	$\pm0.246633934556$
Angle rank:	$1$ (numerical)
Number field:	\(\Q(\sqrt{-2}) \)
Galois group:	$C_2$
Jacobians:	$9$
Isomorphism classes:	9

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

$r$	$1$	$2$	$3$	$4$	$5$
$A(\F_{q^r})$	$306$	$109548$	$36272934$	$12003831648$	$3973198774626$

Point counts of the curve

$r$	$1$	$2$	$3$	$4$	$5$	$6$	$7$	$8$	$9$	$10$
$C(\F_{q^r})$	$306$	$109548$	$36272934$	$12003831648$	$3973198774626$	$1315127817924300$	$435307305349228086$	$144086718331831655808$	$47692703775417453850194$	$15786284949773818294792428$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 9 curves (of which 0 are hyperelliptic):

• $y^2=x^3+301 x+271$
• $y^2=x^3+99 x+198$
• $y^2=x^3+54 x+108$
• $y^2=x^3+323 x+315$
• $y^2=x^3+194 x+194$
• $y^2=x^3+206 x+81$
• $y^2=x^3+178 x+178$
• $y^2=x^3+85 x+85$
• $y^2=x^3+198 x+65$

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{331}$.

Endomorphism algebra over $\F_{331}$

The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-2}) \).

Base change

This is a primitive isogeny class.

Twists

Below is a list of all twists of this isogeny class.

Twist	Extension degree	Common base change
1.331.ba	$2$	(not in LMFDB)