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gp:[N,k,chi] = [16,18,Mod(1,16)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
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magma://Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("16.1");
S:= CuspForms(chi, 18);
N := Newforms(S);
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sage:from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(16, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0, 0]))
N = Newforms(chi, 18, names="a")
Newform invariants
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sage:traces = [2,0,952]
f = next(g for g in N if [g.coefficient(i+1).trace() for i in range(3)] == traces)
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gp:f = lf[1] \\ Warning: the index may be different
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sage:f.q_expansion() # note that sage often uses an isomorphic number field
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gp:mfcoefs(f, 20)
Coefficients of the \(q\)-expansion are expressed in terms of \(\beta = 256\sqrt{2146}\).
We also show the integral \(q\)-expansion of the trace form.
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.
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gp:mfembed(f)
| \( p \) |
Sign
|
| \(2\) |
\( +1 \) |
This newform does not admit any (nontrivial) inner twists.
This newform subspace can be constructed as the kernel of the linear operator
\( T_{3}^{2} - 952T_{3} - 140413680 \)
acting on \(S_{18}^{\mathrm{new}}(\Gamma_0(16))\).
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| $p$ |
$F_p(T)$ |
| $2$ |
\( T^{2} \)
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|
| $3$ |
\( T^{2} - 952 T - 140413680 \)
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|
| $5$ |
\( T^{2} + \cdots - 505586145500 \)
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|
| $7$ |
\( T^{2} + \cdots - 134492404390848 \)
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|
| $11$ |
\( T^{2} + \cdots - 74\!\cdots\!16 \)
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|
| $13$ |
\( T^{2} + \cdots - 13\!\cdots\!28 \)
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|
| $17$ |
\( T^{2} + \cdots + 54\!\cdots\!20 \)
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|
| $19$ |
\( T^{2} + \cdots + 77\!\cdots\!64 \)
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|
| $23$ |
\( T^{2} + \cdots + 23\!\cdots\!32 \)
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|
| $29$ |
\( T^{2} + \cdots + 12\!\cdots\!36 \)
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|
| $31$ |
\( T^{2} + \cdots - 29\!\cdots\!80 \)
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|
| $37$ |
\( T^{2} + \cdots - 79\!\cdots\!36 \)
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|
| $41$ |
\( T^{2} + \cdots - 31\!\cdots\!52 \)
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|
| $43$ |
\( T^{2} + \cdots + 89\!\cdots\!68 \)
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| $47$ |
\( T^{2} + \cdots - 19\!\cdots\!04 \)
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| $53$ |
\( T^{2} + \cdots - 20\!\cdots\!24 \)
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| $59$ |
\( T^{2} + \cdots - 64\!\cdots\!32 \)
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|
| $61$ |
\( T^{2} + \cdots + 56\!\cdots\!20 \)
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| $67$ |
\( T^{2} + \cdots + 40\!\cdots\!92 \)
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| $71$ |
\( T^{2} + \cdots - 89\!\cdots\!40 \)
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| $73$ |
\( T^{2} + \cdots - 76\!\cdots\!48 \)
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| $79$ |
\( T^{2} + \cdots - 23\!\cdots\!20 \)
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| $83$ |
\( T^{2} + \cdots - 31\!\cdots\!12 \)
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| $89$ |
\( T^{2} + \cdots - 41\!\cdots\!76 \)
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| $97$ |
\( T^{2} + \cdots + 32\!\cdots\!16 \)
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