magma:// Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("1332.445");
S:= CuspForms(chi, 2);
N := Newforms(S);
sage:from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(1332, base_ring=CyclotomicField(6))
chi = DirichletCharacter(H, H._module([0, 2, 0]))
N = Newforms(chi, 2, names="a")
This newform subspace can be constructed as the kernel of the linear operator
\( T_{5}^{34} + 7 T_{5}^{33} + 78 T_{5}^{32} + 343 T_{5}^{31} + 2509 T_{5}^{30} + 8811 T_{5}^{29} + \cdots + 12510369 \)
acting on \(S_{2}^{\mathrm{new}}(1332, [\chi])\).