Invariants
| Base field: | $\F_{61}$ |
| Dimension: | $2$ |
| L-polynomial: | $( 1 - 5 x + 61 x^{2} )( 1 + 10 x + 61 x^{2} )$ |
| $1 + 5 x + 72 x^{2} + 305 x^{3} + 3721 x^{4}$ | |
| Frobenius angles: | $\pm0.396286106500$, $\pm0.721142061624$ |
| Angle rank: | $2$ (numerical) |
| Jacobians: | $240$ |
| Cyclic group of points: | no |
| Non-cyclic primes: | $2, 3$ |
This isogeny class is not simple, primitive, ordinary, and not supersingular. It is principally polarizable and contains a Jacobian.
Newton polygon
This isogeny class is ordinary.
| $p$-rank: | $2$ |
| Slopes: | $[0, 0, 1, 1]$ |
Point counts
Point counts of the abelian variety
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
|---|---|---|---|---|---|
| $A(\F_{q^r})$ | $4104$ | $14298336$ | $51511093344$ | $191776431600000$ | $713277901651302504$ |
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
|---|---|---|---|---|---|---|---|---|---|---|
| $C(\F_{q^r})$ | $67$ | $3841$ | $226942$ | $13850833$ | $844519327$ | $51519969286$ | $3142749030187$ | $191707316097793$ | $11694146041323862$ | $713342911315264681$ |
Jacobians and polarizations
This isogeny class is principally polarizable and contains the Jacobians of 240 curves (of which all are hyperelliptic):
- $y^2=49 x^6+32 x^5+42 x^4+40 x^3+29 x^2+22 x+35$
- $y^2=44 x^6+16 x^5+18 x^4+32 x^3+60 x^2+30 x+54$
- $y^2=18 x^6+32 x^5+49 x^4+50 x^3+31 x^2+31 x+23$
- $y^2=15 x^6+9 x^5+11 x^4+36 x^3+x^2+26 x+56$
- $y^2=28 x^6+23 x^5+34 x^4+55 x^3+13 x^2+9 x+36$
- $y^2=9 x^6+x^5+31 x^4+17 x^3+4 x^2+43 x+34$
- $y^2=20 x^6+7 x^5+9 x^4+35 x^3+57 x^2+45 x+15$
- $y^2=33 x^6+39 x^5+2 x^4+37 x^3+32 x^2+47 x+30$
- $y^2=51 x^6+14 x^5+51 x^4+36 x^3+29 x^2+40 x$
- $y^2=31 x^6+56 x^5+24 x^4+51 x^3+42 x^2+31 x+18$
- $y^2=38 x^6+33 x^5+7 x^4+57 x^3+39 x^2+6 x$
- $y^2=20 x^6+11 x^5+19 x^4+34 x^3+10 x^2+43 x+56$
- $y^2=56 x^6+29 x^5+16 x^4+42 x^3+3 x^2+59 x+3$
- $y^2=53 x^6+21 x^5+55 x^4+56 x^3+43 x^2+35 x+14$
- $y^2=3 x^6+8 x^5+24 x^4+51 x^3+49 x^2+59 x+23$
- $y^2=21 x^6+22 x^5+42 x^4+29 x^3+55 x^2+46 x+11$
- $y^2=37 x^6+41 x^5+45 x^4+40 x^3+18 x^2+57 x+6$
- $y^2=49 x^6+37 x^5+10 x^4+30 x^3+44 x^2+11 x+6$
- $y^2=48 x^6+32 x^5+x^4+37 x^3+27 x^2+41 x+38$
- $y^2=40 x^6+30 x^5+24 x^4+60 x^3+43 x^2+34 x+37$
- and 220 more
Decomposition and endomorphism algebra
All geometric endomorphisms are defined over $\F_{61}$.
Endomorphism algebra over $\F_{61}$| The isogeny class factors as 1.61.af $\times$ 1.61.k and its endomorphism algebra is a direct product of the endomorphism algebras for each isotypic factor. The endomorphism algebra for each factor is: |
Base change
This is a primitive isogeny class.