
// Make newform 605.2.g.o in Magma, downloaded from the LMFDB on 19 April 2024.
// To make the character of type GrpDrchElt, type "MakeCharacter_605_g();"
// To make the character of type GrpDrchElt with Codomain the HeckeField, type "MakeCharacter_605_g_Hecke();"
// To make the coeffs of the qexp of the newform in the Hecke field type "qexpCoeffs();"
// To make the newform (type ModFrm), type "MakeNewformModFrm_605_2_g_o();".
// This may take a long time!  To see verbose output, uncomment the SetVerbose lines below.
// The precision argument determines an initial guess on how many Fourier coefficients to use.
// This guess is increased enough to uniquely determine the newform.
// To make the Hecke irreducible modular symbols subspace (type ModSym)
// containing the newform, type "MakeNewformModSym_605_2_g_o();".
// This may take a long time!  To see verbose output, uncomment the SetVerbose line below.
// The default sign is -1.  You can change this with the optional parameter "sign".
function ConvertToHeckeField(input: pass_field := false, Kf := [])
    if not pass_field then
        poly := [1, 5, 24, 114, 541, 162, 155, 72, 43, -12, 6, -1, 1];
        Kf := NumberField(Polynomial([elt : elt in poly]));
        AssignNames(~Kf, ["nu"]);
    end if;
    Rf_num := [[1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], [0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], [5190, 0, 0, 0, 0, 2713, 0, 0, 0, 0, 12, 0], [-67611, 0, 0, 0, 0, 7669, 0, 0, 0, 0, 43, 0], [0, -116873, 0, 0, 0, 0, 7669, 0, 0, 0, 0, 43], [0, -320798, 0, 0, 0, 0, 25720, 0, 0, 0, 0, 141], [-43, -215, -117905, -4902, -23263, -6966, -6665, 4573, -1849, 516, -258, 43], [227, 1135, 559992, 25878, 122807, 36774, 35185, -24714, 9761, -2724, 1362, -227], [5460, 26208, 124488, 590772, 171948, 169260, 78624, 46956, -13104, 6521, -1092, 1092], [638, 3190, 1537440, 72732, 345158, 103356, 98890, -69569, 27434, -7656, 3828, -638], [-1092, -6552, -31668, -2781912, -715260, -767676, -346164, -247884, 72041, -33852, 6552, -5460], [3006, 18036, 87174, 7637059, 1968930, 2113218, 952902, 682362, -198446, 93186, -18036, 15030]];
    Rf_basisdens := [1, 1, 24631, 24631, 24631, 24631, 24631, 24631, 24631, 24631, 24631, 24631];
    Rf_basisnums := ChangeUniverse([[z : z in elt] : elt in Rf_num], Kf);
    Rfbasis := [Rf_basisnums[i]/Rf_basisdens[i] : i in [1..Degree(Kf)]];
    inp_vec := Vector(Rfbasis)*ChangeRing(Transpose(Matrix([[elt : elt in row] : row in input])),Kf);
    return Eltseq(inp_vec);
end function;


// To make the character of type GrpDrchElt, type "MakeCharacter_605_g();"
function MakeCharacter_605_g()
    N := 605;
    order := 5;
    char_gens := [122, 486];
    v := [5, 1];
    // chi(gens[i]) = zeta^v[i]
    assert UnitGenerators(DirichletGroup(N)) eq char_gens;
    F := CyclotomicField(order);
    chi := DirichletCharacterFromValuesOnUnitGenerators(DirichletGroup(N,F),[F|F.1^e:e in v]);
    return MinimalBaseRingCharacter(chi);
end function;

// To make the character of type GrpDrchElt with Codomain the HeckeField, type "MakeCharacter_605_g_Hecke();"
function MakeCharacter_605_g_Hecke(Kf)
    N := 605;
    order := 5;
    char_gens := [122, 486];
    char_values := [[1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], [0, 0, 0, 0, -1, 0, 0, 0, 0, 0, 0, 0]];
    assert UnitGenerators(DirichletGroup(N)) eq char_gens;
    values := ConvertToHeckeField(char_values : pass_field := true, Kf := Kf); // the value of chi on the gens as elements in the Hecke field
    F := Universe(values);// the Hecke field
    chi := DirichletCharacterFromValuesOnUnitGenerators(DirichletGroup(N,F),values);
    return chi;
end function;


function ExtendMultiplicatively(weight, aps, character)
    prec := NextPrime(NthPrime(#aps)) - 1; // we will able to figure out a_0 ... a_prec
    primes := PrimesUpTo(prec);
    prime_powers := primes;
    assert #primes eq #aps;
    log_prec := Floor(Log(prec)/Log(2)); // prec < 2^(log_prec+1)
    F := Universe(aps);
    FXY<X, Y> := PolynomialRing(F, 2);
    // 1/(1 - a_p T + p^(weight - 1) * char(p) T^2) = 1 + a_p T + a_{p^2} T^2 + ...
    R<T> := PowerSeriesRing(FXY : Precision := log_prec + 1);
    recursion := Coefficients(1/(1 - X*T + Y*T^2));
    coeffs := [F!0: i in [1..(prec+1)]];
    coeffs[1] := 1; //a_1
    for i := 1 to #primes do
        p := primes[i];
        coeffs[p] := aps[i];
        b := p^(weight - 1) * F!character(p);
        r := 2;
        p_power := p * p;
        //deals with powers of p
        while p_power le prec do
            Append(~prime_powers, p_power);
            coeffs[p_power] := Evaluate(recursion[r + 1], [aps[i], b]);
            p_power *:= p;
            r +:= 1;
        end while;    
    end for;
    Sort(~prime_powers);
    for pp in prime_powers do
        for k := 1 to Floor(prec/pp) do
            if GCD(k, pp) eq 1 then
                coeffs[pp*k] := coeffs[pp]*coeffs[k];
            end if;
        end for;
    end for;
    return coeffs;
end function;


function qexpCoeffs()
    // To make the coeffs of the qexp of the newform in the Hecke field type "qexpCoeffs();"
    weight := 2;
    raw_aps := [[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1], [0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0], [0, 0, 0, 0, 0, 0, 0, -1, 0, 0, 0, 0], [0, 2, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0], [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], [0, -1, -1, 0, 0, 0, 1, 0, 1, 0, -2, -1], [0, 0, 0, 0, 0, 0, -2, 2, 0, 0, 0, 0], [-2, 0, 0, 1, 2, 1, 0, -2, -1, -1, 2, -1], [-2, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0], [0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0], [0, 1, 1, 0, 0, 0, -1, 0, -1, 0, -4, -1], [0, 0, 0, 0, -2, -2, 0, 0, 0, 0, 0, 0], [-3, 0, 0, 3, 3, 3, 0, -3, 3, -3, 3, -3], [2, 0, -2, -1, 0, 0, 0, 0, 0, 0, 0, 0], [4, 0, 0, 4, -4, 4, 0, 4, 1, -4, -4, -4], [0, -1, -1, 0, 0, 0, 1, 0, 1, 0, 2, -1], [0, -1, 0, 0, -2, 3, 0, 0, 0, 0, 0, 0], [0, 0, 0, 0, 0, 0, -5, 3, 0, 1, 0, 0], [6, 0, 1, 2, 0, 0, 0, 0, 0, 0, 0, 0], [0, 0, 0, 0, 0, 0, 1, 2, 0, 1, 0, 0], [0, -2, 0, 0, 4, -2, 0, 0, 0, 0, 0, 0], [0, 4, 4, 0, 0, 0, -4, 0, -4, 0, 0, 2], [0, 0, 0, 0, 0, 0, 3, 6, 0, 3, 0, 0], [3, 0, -6, -4, 0, 0, 0, 0, 0, 0, 0, 0], [0, 7, 7, 0, 0, 0, -7, 0, -7, 0, 2, 3], [0, -2, -2, 0, 0, 0, 2, 0, 2, 0, 7, 0], [0, 3, 0, 0, -2, -5, 0, 0, 0, 0, 0, 0], [-10, 0, 0, 0, 10, 0, 0, -10, -1, 0, 10, 0], [1, 0, 3, 5, 0, 0, 0, 0, 0, 0, 0, 0], [10, 0, 0, 0, -10, 0, 0, 10, 4, 0, -10, 0], [0, 0, 0, 0, 0, 0, 3, -2, 0, -2, 0, 0], [2, 0, 5, -1, 0, 0, 0, 0, 0, 0, 0, 0], [0, 0, 0, 0, 0, 0, -3, 0, 0, 3, 0, 0], [0, -3, 0, 0, 8, 3, 0, 0, 0, 0, 0, 0], [0, 0, 0, 0, 0, 0, -1, 7, 0, -1, 0, 0], [-2, 0, 0, -5, 2, -5, 0, -2, -1, 5, 2, 5], [0, 0, 0, -2, 0, -2, 0, 0, 2, 2, 0, 2], [0, -6, -6, 0, 0, 0, 6, 0, 6, 0, -14, 3], [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -6, 3], [-2, 0, 0, -3, 2, -3, 0, -2, 1, 3, 2, 3], [-6, 0, 0, 4, 6, 4, 0, -6, 0, -4, 6, -4], [0, 0, 0, 0, 0, 0, 0, -1, 0, 2, 0, 0], [0, 7, 0, 0, -4, 3, 0, 0, 0, 0, 0, 0], [0, 0, 0, 0, 0, 0, 8, 8, 0, 2, 0, 0], [-12, 0, 0, -2, 0, 0, 0, 0, 0, 0, 0, 0], [2, 0, 0, -8, 0, 0, 0, 0, 0, 0, 0, 0], [0, 3, 3, 0, 0, 0, -3, 0, -3, 0, 8, -3], [2, 0, 0, -9, -2, -9, 0, 2, -8, 9, -2, 9], [0, 6, 0, 0, 0, -1, 0, 0, 0, 0, 0, 0], [0, 4, 4, 0, 0, 0, -4, 0, -4, 0, 11, -2], [0, 3, 3, 0, 0, 0, -3, 0, -3, 0, 0, 1], [10, 0, 0, -5, -10, -5, 0, 10, 1, 5, -10, 5], [-1, 0, 1, 5, 0, 0, 0, 0, 0, 0, 0, 0], [0, 9, 9, 0, 0, 0, -9, 0, -9, 0, -6, 9], [0, 5, 0, 0, 4, 9, 0, 0, 0, 0, 0, 0], [12, 0, -3, 3, 0, 0, 0, 0, 0, 0, 0, 0], [0, 0, 0, 0, 0, 0, 1, -1, 0, 7, 0, 0], [0, 4, 0, 0, -14, -2, 0, 0, 0, 0, 0, 0], [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 20, -2], [0, 0, 0, 0, 0, 0, 8, -2, 0, 8, 0, 0], [10, 0, 0, 0, -10, 0, 0, 10, 5, 0, -10, 0], [0, -5, 0, 0, 2, -11, 0, 0, 0, 0, 0, 0], [-6, 0, -7, -7, 0, 0, 0, 0, 0, 0, 0, 0], [-6, 0, 0, 1, 6, 1, 0, -6, -9, -1, 6, -1], [0, 0, 0, 0, 0, 0, -5, -20, 0, -3, 0, 0], [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 6, 4], [16, 0, -1, 3, 0, 0, 0, 0, 0, 0, 0, 0], [0, -5, 0, 0, -2, -1, 0, 0, 0, 0, 0, 0], [0, 0, 0, 0, 0, 0, 0, -24, 0, 3, 0, 0], [0, 0, 0, -4, 0, -4, 0, 0, -2, 4, 0, 4], [-14, 0, -11, 3, 0, 0, 0, 0, 0, 0, 0, 0], [0, 5, 0, 0, 4, 5, 0, 0, 0, 0, 0, 0], [0, -1, 0, 0, -10, -2, 0, 0, 0, 0, 0, 0], [-2, 0, 3, -7, 0, 0, 0, 0, 0, 0, 0, 0], [0, 0, 0, 0, 0, 0, 10, 4, 0, 0, 0, 0], [0, 9, 9, 0, 0, 0, -9, 0, -9, 0, 12, 7], [0, 9, 0, 0, 15, 5, 0, 0, 0, 0, 0, 0], [24, 0, 10, -2, 0, 0, 0, 0, 0, 0, 0, 0], [0, 0, 0, 0, 0, 0, -4, 7, 0, -4, 0, 0], [0, -1, -1, 0, 0, 0, 1, 0, 1, 0, 19, 7], [16, 0, -5, 3, 0, 0, 0, 0, 0, 0, 0, 0], [-7, 0, 0, -1, 7, -1, 0, -7, 7, 1, 7, 1], [0, -8, -8, 0, 0, 0, 8, 0, 8, 0, -20, -2], [0, -9, 0, 0, 4, -5, 0, 0, 0, 0, 0, 0], [22, 0, -6, 0, 0, 0, 0, 0, 0, 0, 0, 0], [8, 0, 0, 5, -8, 5, 0, 8, 2, -5, -8, -5], [0, -1, -1, 0, 0, 0, 1, 0, 1, 0, 11, -7], [0, 0, 0, 0, 0, 0, 1, 24, 0, 5, 0, 0], [1, 0, -8, -6, 0, 0, 0, 0, 0, 0, 0, 0], [-2, 0, -4, 5, 0, 0, 0, 0, 0, 0, 0, 0], [0, 0, 0, 0, 0, 0, -1, -2, 0, 2, 0, 0], [0, 0, 0, 0, 0, 0, -6, 0, 0, 0, 0, 0], [-14, 0, 0, 3, 14, 3, 0, -14, 3, -3, 14, -3], [0, -2, 0, 0, -4, -8, 0, 0, 0, 0, 0, 0], [0, -10, 0, 0, -10, -6, 0, 0, 0, 0, 0, 0], [22, 0, 0, 4, -22, 4, 0, 22, 7, -4, -22, -4], [3, 0, 0, 10, -3, 10, 0, 3, 0, -10, -3, -10], [0, -12, 0, 0, 3, -2, 0, 0, 0, 0, 0, 0], [0, 0, 0, 0, 0, 0, -3, -8, 0, -5, 0, 0], [0, 14, 14, 0, 0, 0, -14, 0, -14, 0, 25, -2], [-10, 0, 0, 9, 10, 9, 0, -10, 9, -9, 10, -9], [0, 4, 0, 0, -22, -2, 0, 0, 0, 0, 0, 0], [0, -4, -4, 0, 0, 0, 4, 0, 4, 0, 2, 11], [-19, 0, 0, 3, 19, 3, 0, -19, -7, -3, 19, -3], [8, 0, -8, 2, 0, 0, 0, 0, 0, 0, 0, 0], [0, 0, 0, 0, 0, 0, -15, -10, 0, -9, 0, 0], [0, 14, 0, 0, 16, 5, 0, 0, 0, 0, 0, 0], [-6, 0, 15, 3, 0, 0, 0, 0, 0, 0, 0, 0], [0, 0, 0, 0, 0, 0, 1, 2, 0, -5, 0, 0], [0, 6, 0, 0, -4, 0, 0, 0, 0, 0, 0, 0], [0, -3, -3, 0, 0, 0, 3, 0, 3, 0, -16, 7], [4, 0, 0, 4, -4, 4, 0, 4, 2, -4, -4, -4], [14, 0, 5, -1, 0, 0, 0, 0, 0, 0, 0, 0], [-28, 0, 0, 6, 28, 6, 0, -28, -2, -6, 28, -6], [0, 2, 0, 0, -16, -2, 0, 0, 0, 0, 0, 0], [-18, 0, 0, 6, 18, 6, 0, -18, -6, -6, 18, -6], [0, 0, 0, 0, 0, 0, 4, 4, 0, -1, 0, 0], [0, -8, -8, 0, 0, 0, 8, 0, 8, 0, 10, -3], [0, -14, 0, 0, 8, -8, 0, 0, 0, 0, 0, 0], [24, 0, 12, -6, 0, 0, 0, 0, 0, 0, 0, 0], [-5, 0, -1, -9, 0, 0, 0, 0, 0, 0, 0, 0], [0, -9, -9, 0, 0, 0, 9, 0, 9, 0, -16, -9], [0, 0, 0, 0, 0, 0, 0, -12, 0, 4, 0, 0], [4, 0, 4, 1, 0, 0, 0, 0, 0, 0, 0, 0], [0, -13, -13, 0, 0, 0, 13, 0, 13, 0, -12, -1], [4, 0, 0, 12, -4, 12, 0, 4, -2, -12, -4, -12], [0, 0, 0, 0, 0, 0, -16, 3, 0, -16, 0, 0], [0, -13, 0, 0, 4, -1, 0, 0, 0, 0, 0, 0], [-16, 0, -6, 3, 0, 0, 0, 0, 0, 0, 0, 0], [0, -6, 0, 0, 2, 12, 0, 0, 0, 0, 0, 0], [0, 12, 12, 0, 0, 0, -12, 0, -12, 0, 20, 6], [0, 0, 0, 0, 0, 0, 15, 12, 0, 10, 0, 0], [-2, 0, 0, -6, 2, -6, 0, -2, 6, 6, 2, 6], [0, -5, -5, 0, 0, 0, 5, 0, 5, 0, -4, -11], [0, -12, -12, 0, 0, 0, 12, 0, 12, 0, 18, 0], [0, 0, -22, -8, 0, 0, 0, 0, 0, 0, 0, 0], [2, 0, 0, -9, -2, -9, 0, 2, -19, 9, -2, 9], [0, 0, 0, 0, 0, 0, -3, -14, 0, 6, 0, 0], [0, 0, 0, 0, 0, 0, -3, -6, 0, -5, 0, 0], [0, 0, 0, 0, 0, 0, 0, -12, 0, 6, 0, 0], [-4, 0, 0, -3, 4, -3, 0, -4, 3, 3, 4, 3], [0, -13, 0, 0, -17, -1, 0, 0, 0, 0, 0, 0], [0, -1, -1, 0, 0, 0, 1, 0, 1, 0, 0, -8], [0, -13, -13, 0, 0, 0, 13, 0, 13, 0, -4, -10], [0, 5, 0, 0, -13, 1, 0, 0, 0, 0, 0, 0], [30, 0, 0, -4, -30, -4, 0, 30, 12, 4, -30, 4], [0, 0, 0, 0, 0, 0, -4, 20, 0, -8, 0, 0], [4, 0, -8, -2, 0, 0, 0, 0, 0, 0, 0, 0], [28, 0, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0], [0, 0, 0, 0, 0, 0, 25, -10, 0, 4, 0, 0], [22, 0, 0, 13, -22, 13, 0, 22, 11, -13, -22, -13], [-5, 0, -17, 1, 0, 0, 0, 0, 0, 0, 0, 0], [-22, 0, 0, 3, 22, 3, 0, -22, -5, -3, 22, -3], [0, 2, 0, 0, 4, 9, 0, 0, 0, 0, 0, 0], [0, 0, 0, 0, 0, 0, 10, 22, 0, 5, 0, 0], [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -24, -6], [0, 0, 0, 0, 0, 0, -11, 24, 0, 5, 0, 0], [0, 0, 0, 0, 0, 0, 10, 26, 0, 10, 0, 0], [0, -10, -10, 0, 0, 0, 10, 0, 10, 0, 16, -8], [0, 0, 0, 0, 0, 0, -16, 7, 0, -4, 0, 0], [-4, 0, 11, 9, 0, 0, 0, 0, 0, 0, 0, 0], [0, -2, 0, 0, 2, 12, 0, 0, 0, 0, 0, 0], [-14, 0, 9, -3, 0, 0, 0, 0, 0, 0, 0, 0], [-22, 0, 0, 0, 22, 0, 0, -22, -10, 0, 22, 0], [0, -18, -18, 0, 0, 0, 18, 0, 18, 0, -18, -4], [0, 13, 0, 0, 14, 10, 0, 0, 0, 0, 0, 0], [34, 0, -13, -11, 0, 0, 0, 0, 0, 0, 0, 0], [0, 9, 0, 0, 32, 3, 0, 0, 0, 0, 0, 0]];
    aps := ConvertToHeckeField(raw_aps);
    chi := MakeCharacter_605_g_Hecke(Universe(aps));
    return ExtendMultiplicatively(weight, aps, chi);
end function;


// To make the newform (type ModFrm), type "MakeNewformModFrm_605_2_g_o();".
// This may take a long time!  To see verbose output, uncomment the SetVerbose lines below.
// The precision argument determines an initial guess on how many Fourier coefficients to use.
// This guess is increased enough to uniquely determine the newform.
function MakeNewformModFrm_605_2_g_o(:prec:=12)
    chi := MakeCharacter_605_g();
    f_vec := qexpCoeffs();
    Kf := Universe(f_vec);
    // SetVerbose("ModularForms", true);
    // SetVerbose("ModularSymbols", true);
    S := CuspidalSubspace(ModularForms(chi, 2));
    S := BaseChange(S, Kf);
    maxprec := NextPrime(997) - 1;
    while true do
        trunc_vec := Vector(Kf, [0] cat [f_vec[i]: i in [1..prec]]);
        B := Basis(S, prec + 1);
        S_basismat := Matrix([AbsEltseq(g): g in B]);
        if Rank(S_basismat) eq Min(NumberOfRows(S_basismat), NumberOfColumns(S_basismat)) then
            S_basismat := ChangeRing(S_basismat,Kf);
            f_lincom := Solution(S_basismat,trunc_vec);
            f := &+[f_lincom[i]*Basis(S)[i] : i in [1..#Basis(S)]];
            return f;
        end if;
        error if prec eq maxprec, "Unable to distinguish newform within newspace";
        prec := Min(Ceiling(1.25 * prec), maxprec);
    end while;
end function;


// To make the Hecke irreducible modular symbols subspace (type ModSym)
// containing the newform, type "MakeNewformModSym_605_2_g_o();".
// This may take a long time!  To see verbose output, uncomment the SetVerbose line below.
// The default sign is -1.  You can change this with the optional parameter "sign".
function MakeNewformModSym_605_2_g_o( : sign := -1)
    R<x> := PolynomialRing(Rationals());
    chi := MakeCharacter_605_g();
    // SetVerbose("ModularSymbols", true);
    Snew := NewSubspace(CuspidalSubspace(ModularSymbols(chi,2,sign)));
    Vf := Kernel([<2,R![6561, 5103, 4698, 3492, 2671, 656, 419, 102, 53, 6, 8, 1, 1]>,<3,R![1, -5, 24, -114, 541, -162, 155, -72, 43, 12, 6, 1, 1]>],Snew);
    return Vf;
end function;