Properties

Label 3871.1.cb.a
Level $3871$
Weight $1$
Character orbit 3871.cb
Analytic conductor $1.932$
Analytic rank $0$
Dimension $24$
Projective image $D_{13}$
CM discriminant -7
Inner twists $8$

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Show commands: Magma / Pari/GP / SageMath

Newspace parameters

Copy content comment:Compute space of new eigenforms
 
Copy content gp:[N,k,chi] = [3871,1,Mod(117,3871)] mf = mfinit([N,k,chi],0) lf = mfeigenbasis(mf)
 
Copy content magma://Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code chi := DirichletCharacter("3871.117"); S:= CuspForms(chi, 1); N := Newforms(S);
 
Copy content sage:from sage.modular.dirichlet import DirichletCharacter H = DirichletGroup(3871, base_ring=CyclotomicField(78)) chi = DirichletCharacter(H, H._module([65, 36])) B = ModularForms(chi, 1).cuspidal_submodule().basis() N = [B[i] for i in range(len(B))]
 
Level: \( N \) \(=\) \( 3871 = 7^{2} \cdot 79 \)
Weight: \( k \) \(=\) \( 1 \)
Character orbit: \([\chi]\) \(=\) 3871.cb (of order \(78\), degree \(24\), not minimal)

Newform invariants

Copy content comment:select newform
 
Copy content sage:traces = [] f = next(g for g in N if [g.coefficient(i+1).trace() for i in range(0)] == traces)
 
Copy content gp:f = lf[1] \\ Warning: the index may be different
 
Self dual: no
Analytic conductor: \(1.93188066390\)
Analytic rank: \(0\)
Dimension: \(24\)
Coefficient field: \(\Q(\zeta_{39})\)
Copy content comment:defining polynomial
 
Copy content gp:f.mod \\ as an extension of the character field
 
Defining polynomial: \( x^{24} - x^{23} + x^{21} - x^{20} + x^{18} - x^{17} + x^{15} - x^{14} + x^{12} - x^{10} + x^{9} + \cdots + 1 \) Copy content Toggle raw display
Coefficient ring: \(\Z[a_1, \ldots, a_{4}]\)
Coefficient ring index: \( 1 \)
Twist minimal: no (minimal twist has level 553)
Projective image: \(D_{13}\)
Projective field: Galois closure of \(\mathbb{Q}[x]/(x^{13} - \cdots)\)

$q$-expansion

Copy content comment:q-expansion
 
Copy content sage:f.q_expansion() # note that sage often uses an isomorphic number field
 
Copy content gp:mfcoefs(f, 20)
 

The \(q\)-expansion and trace form are shown below.

\(f(q)\) \(=\) \( q + ( - \zeta_{78}^{37} - \zeta_{78}) q^{2} + (\zeta_{78}^{38} + \cdots + \zeta_{78}^{2}) q^{4} + (\zeta_{78}^{36} - \zeta_{78}^{33} + \cdots + 1) q^{8} + \zeta_{78}^{16} q^{9} + ( - \zeta_{78}^{35} + \zeta_{78}^{26}) q^{11}+ \cdots + (\zeta_{78}^{12} - \zeta_{78}^{3}) q^{99}+O(q^{100}) \) Copy content Toggle raw display
\(\operatorname{Tr}(f)(q)\) \(=\) \( 24 q + 2 q^{2} + 3 q^{4} + 18 q^{8} + q^{9} - 11 q^{11} + 5 q^{16} + 2 q^{18} - 8 q^{22} + 2 q^{23} + q^{25} - 4 q^{29} + 6 q^{32} - 6 q^{36} + 2 q^{37} - 4 q^{43} + 6 q^{44} + 4 q^{46} - 4 q^{50} - 11 q^{53}+ \cdots - 4 q^{99}+O(q^{100}) \) Copy content Toggle raw display

Character values

We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/3871\mathbb{Z}\right)^\times\).

\(n\) \(1030\) \(2845\)
\(\chi(n)\) \(-\zeta_{78}^{3}\) \(\zeta_{78}^{13}\)

Embeddings

For each embedding \(\iota_m\) of the coefficient field, the values \(\iota_m(a_n)\) are shown below.

For more information on an embedded modular form you can click on its label.

Copy content comment:embeddings in the coefficient field
 
Copy content gp:mfembed(f)
 
Label   \(\iota_m(\nu)\) \( a_{2} \) \( a_{3} \) \( a_{4} \) \( a_{5} \) \( a_{6} \) \( a_{7} \) \( a_{8} \) \( a_{9} \) \( a_{10} \)
117.1
−0.996757 + 0.0804666i
−0.200026 0.979791i
0.278217 0.960518i
−0.845190 + 0.534466i
−0.0402659 + 0.999189i
−0.919979 0.391967i
−0.996757 0.0804666i
0.948536 0.316668i
0.987050 0.160411i
0.987050 + 0.160411i
0.692724 0.721202i
0.428693 0.903450i
0.948536 + 0.316668i
0.799443 + 0.600742i
0.692724 + 0.721202i
−0.0402659 0.999189i
−0.845190 0.534466i
0.799443 0.600742i
−0.200026 + 0.979791i
−0.632445 + 0.774605i
−0.00970705 + 0.240878i 0 0.938829 + 0.0757901i 0 0 0 −0.0564276 + 0.464723i 0.278217 0.960518i 0
166.1 −1.12001 1.37176i 0 −0.427281 + 2.09296i 0 0 0 1.78152 0.935016i −0.996757 + 0.0804666i 0
362.1 −0.566973 0.426052i 0 −0.138280 0.477398i 0 0 0 −0.376485 + 0.992709i −0.200026 0.979791i 0
460.1 −0.416498 + 1.43792i 0 −1.04894 0.663311i 0 0 0 0.270132 0.239316i −0.919979 0.391967i 0
852.1 −1.03702 + 1.07966i 0 −0.0499730 1.24007i 0 0 0 0.270132 + 0.239316i 0.799443 + 0.600742i 0
1048.1 −0.227255 1.11317i 0 −0.267521 + 0.113980i 0 0 0 −0.457721 0.663123i 0.987050 + 0.160411i 0
1158.1 −0.00970705 0.240878i 0 0.938829 0.0757901i 0 0 0 −0.0564276 0.464723i 0.278217 + 0.960518i 0
1195.1 1.74798 + 0.284074i 0 2.02620 + 0.676444i 0 0 0 1.78152 + 0.935016i 0.428693 + 0.903450i 0
1207.1 1.93559 + 0.156257i 0 2.73503 + 0.444486i 0 0 0 3.33898 + 0.822984i −0.845190 0.534466i 0
1440.1 1.93559 0.156257i 0 2.73503 0.444486i 0 0 0 3.33898 0.822984i −0.845190 + 0.534466i 0
1489.1 0.652458 + 0.277987i 0 −0.344299 0.358453i 0 0 0 −0.376485 0.992709i 0.948536 0.316668i 0
1697.1 −0.203753 0.128845i 0 −0.403779 0.850945i 0 0 0 −0.0564276 + 0.464723i 0.692724 + 0.721202i 0
1746.1 1.74798 0.284074i 0 2.02620 0.676444i 0 0 0 1.78152 0.935016i 0.428693 0.903450i 0
1881.1 1.07766 0.359776i 0 0.232470 0.174690i 0 0 0 −0.457721 + 0.663123i −0.632445 0.774605i 0
1942.1 0.652458 0.277987i 0 −0.344299 + 0.358453i 0 0 0 −0.376485 + 0.992709i 0.948536 + 0.316668i 0
2040.1 −1.03702 1.07966i 0 −0.0499730 + 1.24007i 0 0 0 0.270132 0.239316i 0.799443 0.600742i 0
2432.1 −0.416498 1.43792i 0 −1.04894 + 0.663311i 0 0 0 0.270132 + 0.239316i −0.919979 + 0.391967i 0
2628.1 1.07766 + 0.359776i 0 0.232470 + 0.174690i 0 0 0 −0.457721 0.663123i −0.632445 + 0.774605i 0
2775.1 −1.12001 + 1.37176i 0 −0.427281 2.09296i 0 0 0 1.78152 + 0.935016i −0.996757 0.0804666i 0
3020.1 −0.832471 + 1.75440i 0 −1.75245 2.14636i 0 0 0 3.33898 0.822984i −0.0402659 0.999189i 0
See all 24 embeddings
\(n\): e.g. 2-40 or 990-1000
Embeddings: e.g. 1-3 or 117.1
Significant digits:
Format:

Inner twists

Char Parity Ord Mult Type
1.a even 1 1 trivial
7.b odd 2 1 CM by \(\Q(\sqrt{-7}) \)
7.c even 3 1 inner
7.d odd 6 1 inner
79.e even 13 1 inner
553.x odd 26 1 inner
553.ba even 39 1 inner
553.bh odd 78 1 inner

Twists

       By twisting character orbit
Char Parity Ord Mult Type Twist Min Dim
1.a even 1 1 trivial 3871.1.cb.a 24
7.b odd 2 1 CM 3871.1.cb.a 24
7.c even 3 1 553.1.x.a 12
7.c even 3 1 inner 3871.1.cb.a 24
7.d odd 6 1 553.1.x.a 12
7.d odd 6 1 inner 3871.1.cb.a 24
79.e even 13 1 inner 3871.1.cb.a 24
553.x odd 26 1 inner 3871.1.cb.a 24
553.ba even 39 1 553.1.x.a 12
553.ba even 39 1 inner 3871.1.cb.a 24
553.bh odd 78 1 553.1.x.a 12
553.bh odd 78 1 inner 3871.1.cb.a 24
    
        By twisted newform orbit
Twist Min Dim Char Parity Ord Mult Type
553.1.x.a 12 7.c even 3 1
553.1.x.a 12 7.d odd 6 1
553.1.x.a 12 553.ba even 39 1
553.1.x.a 12 553.bh odd 78 1
3871.1.cb.a 24 1.a even 1 1 trivial
3871.1.cb.a 24 7.b odd 2 1 CM
3871.1.cb.a 24 7.c even 3 1 inner
3871.1.cb.a 24 7.d odd 6 1 inner
3871.1.cb.a 24 79.e even 13 1 inner
3871.1.cb.a 24 553.x odd 26 1 inner
3871.1.cb.a 24 553.ba even 39 1 inner
3871.1.cb.a 24 553.bh odd 78 1 inner

Hecke kernels

This newform subspace is the entire newspace \(S_{1}^{\mathrm{new}}(3871, [\chi])\).

Hecke characteristic polynomials

$p$ $F_p(T)$
$2$ \( T^{24} - 2 T^{23} + \cdots + 1 \) Copy content Toggle raw display
$3$ \( T^{24} \) Copy content Toggle raw display
$5$ \( T^{24} \) Copy content Toggle raw display
$7$ \( T^{24} \) Copy content Toggle raw display
$11$ \( T^{24} + 11 T^{23} + \cdots + 1 \) Copy content Toggle raw display
$13$ \( T^{24} \) Copy content Toggle raw display
$17$ \( T^{24} \) Copy content Toggle raw display
$19$ \( T^{24} \) Copy content Toggle raw display
$23$ \( (T^{12} - T^{11} + 6 T^{10} + \cdots + 1)^{2} \) Copy content Toggle raw display
$29$ \( (T^{12} + 2 T^{11} + \cdots + 1)^{2} \) Copy content Toggle raw display
$31$ \( T^{24} \) Copy content Toggle raw display
$37$ \( T^{24} - 2 T^{23} + \cdots + 1 \) Copy content Toggle raw display
$41$ \( T^{24} \) Copy content Toggle raw display
$43$ \( (T^{12} + 2 T^{11} + \cdots + 1)^{2} \) Copy content Toggle raw display
$47$ \( T^{24} \) Copy content Toggle raw display
$53$ \( T^{24} + 11 T^{23} + \cdots + 1 \) Copy content Toggle raw display
$59$ \( T^{24} \) Copy content Toggle raw display
$61$ \( T^{24} \) Copy content Toggle raw display
$67$ \( T^{24} - 2 T^{23} + \cdots + 1 \) Copy content Toggle raw display
$71$ \( (T^{12} + 2 T^{11} + \cdots + 1)^{2} \) Copy content Toggle raw display
$73$ \( T^{24} \) Copy content Toggle raw display
$79$ \( T^{24} - T^{23} + \cdots + 1 \) Copy content Toggle raw display
$83$ \( T^{24} \) Copy content Toggle raw display
$89$ \( T^{24} \) Copy content Toggle raw display
$97$ \( T^{24} \) Copy content Toggle raw display
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