
// Make newform 2900.2.c.i in Magma, downloaded from the LMFDB on 07 March 2026.
// To make the character of type GrpDrchElt, type "MakeCharacter_2900_c();"
// To make the character of type GrpDrchElt with Codomain the HeckeField, type "MakeCharacter_2900_c_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_2900_2_c_i();".
// 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_2900_2_c_i();".
// 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 := [9, 0, 75, 0, 163, 0, 99, 0, 18, 0, 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, 1, 0, 0, 0, 0, 0, 0, 0, 0], [-3, 0, 109, 0, 117, 0, 21, 0, 1, 0], [0, 402, 0, 514, 0, 162, 0, 21, 0, 1], [309, 0, 623, 0, 279, 0, 42, 0, 2, 0], [-93, 0, -436, 0, -348, 0, -69, 0, -4, 0], [408, 0, 1886, 0, 1323, 0, 249, 0, 14, 0], [0, 2436, 0, 6307, 0, 4131, 0, 768, 0, 43], [0, -1491, 0, -6172, 0, -4131, 0, -768, 0, -43], [0, 2328, 0, 10096, 0, 7263, 0, 1389, 0, 79]];
    Rf_basisdens := [1, 1, 45, 135, 45, 15, 45, 135, 135, 135];
    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_2900_c();"
function MakeCharacter_2900_c()
    N := 2900;
    order := 2;
    char_gens := [1451, 1277, 901];
    v := [2, 1, 2];
    // 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_2900_c_Hecke();"
function MakeCharacter_2900_c_Hecke( : Kf := false)
    N := 2900;
    order := 2;
    char_gens := [1451, 1277, 901];
    char_values := [[1, 0, 0, 0, 0, 0, 0, 0, 0, 0], [-1, 0, 0, 0, 0, 0, 0, 0, 0, 0], [1, 0, 0, 0, 0, 0, 0, 0, 0, 0]];
    assert UnitGenerators(DirichletGroup(N)) eq char_gens;
    values := ConvertToHeckeField(char_values : pass_field := ISA(Type(Kf), Fld), 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]];
    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], [0, 0, 0, 0, 0, 0, 0, 0, 0, 0], [0, 0, 0, 1, 0, 0, 0, 0, 0, 1], [1, 0, 1, 0, 1, 0, 0, 0, 0, 0], [0, -1, 0, -3, 0, 0, 0, 0, -1, -1], [0, -1, 0, 1, 0, 0, 0, -1, 1, -1], [1, 0, 0, 0, 0, 1, -1, 0, 0, 0], [0, -2, 0, -1, 0, 0, 0, -1, 2, 1], [1, 0, 0, 0, 0, 0, 0, 0, 0, 0], [0, 0, 1, 0, 0, -2, 1, 0, 0, 0], [0, -2, 0, 0, 0, 0, 0, -1, -1, -1], [0, 0, 0, 0, -2, -1, -1, 0, 0, 0], [0, -1, 0, 0, 0, 0, 0, -1, 2, 1], [0, -1, 0, 1, 0, 0, 0, 0, 0, 0], [0, -3, 0, -3, 0, 0, 0, -1, 1, 0], [6, 0, 0, 0, -1, 3, 2, 0, 0, 0], [2, 0, 3, 0, 1, 2, 0, 0, 0, 0], [0, 2, 0, -1, 0, 0, 0, 1, -5, -1], [4, 0, 1, 0, -2, 1, -3, 0, 0, 0], [0, -1, 0, -3, 0, 0, 0, 0, 1, 1], [-2, 0, 0, 0, 3, -4, -1, 0, 0, 0], [0, 3, 0, -3, 0, 0, 0, -1, -3, 1], [2, 0, 2, 0, -3, 2, 3, 0, 0, 0], [0, -1, 0, 5, 0, 0, 0, 2, 0, 2], [-2, 0, 1, 0, 0, 1, -4, 0, 0, 0], [0, -2, 0, -5, 0, 0, 0, 1, 1, 2], [0, 0, 0, 3, 0, 0, 0, 3, 3, -1], [-1, 0, 4, 0, 2, -2, -1, 0, 0, 0], [0, -1, 0, -5, 0, 0, 0, 1, 3, -2], [0, 1, 0, 0, 0, 0, 0, -3, 1, 3], [10, 0, -2, 0, -1, 2, 2, 0, 0, 0], [0, -3, 0, 0, 0, 0, 0, 0, 0, -4], [-5, 0, 6, 0, -2, -1, -3, 0, 0, 0], [2, 0, -1, 0, 2, -6, -1, 0, 0, 0], [0, 0, 1, 0, 5, 0, -1, 0, 0, 0], [0, 2, 0, 14, 0, 0, 0, 1, 1, 0], [0, 2, 0, -6, 0, 0, 0, 2, -2, -6], [0, 2, 0, 1, 0, 0, 0, 0, 0, 0], [0, -2, 0, -10, 0, 0, 0, 0, -3, -1], [-1, 0, 5, 0, -1, -2, -4, 0, 0, 0], [-4, 0, -3, 0, 2, -6, 1, 0, 0, 0], [1, 0, -2, 0, 4, -4, -3, 0, 0, 0], [0, 5, 0, -3, 0, 0, 0, 3, -3, 4], [0, -6, 0, 0, 0, 0, 0, 2, -3, 2], [3, 0, -1, 0, -1, 3, -3, 0, 0, 0], [5, 0, -3, 0, -4, 2, -3, 0, 0, 0], [0, 3, 0, -10, 0, 0, 0, 2, -3, -2], [0, 3, 0, -9, 0, 0, 0, 0, -4, -1], [-1, 0, 1, 0, 0, 3, 5, 0, 0, 0], [0, -3, 0, 0, 0, 0, 0, 3, 1, 0], [8, 0, -1, 0, 2, 4, 4, 0, 0, 0], [-2, 0, -4, 0, -4, 4, 3, 0, 0, 0], [3, 0, -3, 0, 1, 0, 7, 0, 0, 0], [0, 5, 0, 1, 0, 0, 0, -1, -1, 2], [0, 1, 0, -10, 0, 0, 0, 3, -2, -6], [-6, 0, 0, 0, 1, -7, -1, 0, 0, 0], [-1, 0, 0, 0, 1, -2, 2, 0, 0, 0], [0, -4, 0, 14, 0, 0, 0, 3, 3, 2], [-2, 0, 1, 0, -4, 5, 1, 0, 0, 0], [0, -4, 0, 6, 0, 0, 0, -1, 1, 5], [0, 4, 0, 11, 0, 0, 0, 1, 3, 5], [0, 2, 0, -4, 0, 0, 0, 2, -5, -4], [1, 0, -5, 0, 3, -6, -7, 0, 0, 0], [0, -5, 0, -5, 0, 0, 0, -6, 1, 4], [0, 0, 0, -12, 0, 0, 0, 4, -6, -7], [-5, 0, 5, 0, -3, 4, 3, 0, 0, 0], [0, -1, 0, 14, 0, 0, 0, -5, 2, -2], [0, -4, 0, -5, 0, 0, 0, 3, 2, 4], [-2, 0, 3, 0, 2, 2, 6, 0, 0, 0], [0, -9, 0, -3, 0, 0, 0, 1, -6, 0], [10, 0, 7, 0, 1, -5, -1, 0, 0, 0], [0, 2, 0, 14, 0, 0, 0, 1, 6, 7], [0, -2, 0, 1, 0, 0, 0, 6, 0, 1], [-6, 0, -4, 0, -2, 3, 0, 0, 0, 0], [0, 0, 0, -3, 0, 0, 0, 1, -4, 0], [1, 0, -5, 0, 0, 6, 4, 0, 0, 0], [0, -5, 0, 18, 0, 0, 0, -3, -2, 3], [0, 0, 0, 0, 6, 1, 2, 0, 0, 0], [-4, 0, -11, 0, 3, -1, -1, 0, 0, 0], [14, 0, 2, 0, 0, 3, 6, 0, 0, 0], [-5, 0, 11, 0, -1, -4, 1, 0, 0, 0], [12, 0, 3, 0, 1, 3, 6, 0, 0, 0], [0, -8, 0, 4, 0, 0, 0, 1, 9, 0], [8, 0, 4, 0, -2, 10, 3, 0, 0, 0], [0, -2, 0, 5, 0, 0, 0, -2, -4, -1], [-6, 0, 3, 0, 4, -3, 1, 0, 0, 0], [0, -2, 0, 15, 0, 0, 0, -3, -3, 7], [-12, 0, 12, 0, -3, -2, -5, 0, 0, 0], [0, 3, 0, 8, 0, 0, 0, 2, 1, -4], [0, 6, 0, -9, 0, 0, 0, -3, 3, 4], [1, 0, -8, 0, 1, -4, -4, 0, 0, 0], [0, -11, 0, 0, 0, 0, 0, 1, -3, -9], [1, 0, 4, 0, 4, 1, -8, 0, 0, 0], [-13, 0, -8, 0, 8, -5, 2, 0, 0, 0], [0, -2, 0, 8, 0, 0, 0, 1, -5, 3], [-11, 0, 4, 0, -1, -1, -1, 0, 0, 0], [-11, 0, 1, 0, -4, -2, 1, 0, 0, 0], [0, 0, 0, -1, 0, 0, 0, 9, -13, -8], [-9, 0, -5, 0, -1, -9, -1, 0, 0, 0], [0, 3, 0, -8, 0, 0, 0, 1, -1, -4], [0, 1, 0, 2, 0, 0, 0, -3, 3, -8], [0, 4, 0, 14, 0, 0, 0, 1, 5, 2], [-7, 0, 8, 0, -2, 13, 4, 0, 0, 0], [-17, 0, -4, 0, -4, -6, -6, 0, 0, 0], [0, 8, 0, 14, 0, 0, 0, 4, -3, -4], [0, -2, 0, -7, 0, 0, 0, 8, -3, 2], [0, 5, 0, 7, 0, 0, 0, 6, -5, -8], [7, 0, 7, 0, -5, 1, -2, 0, 0, 0], [-10, 0, -3, 0, -1, 6, 7, 0, 0, 0], [0, 5, 0, -4, 0, 0, 0, -1, 5, -1], [0, 7, 0, -5, 0, 0, 0, -1, -11, -2], [0, 2, 0, -5, 0, 0, 0, -2, 12, -2], [-17, 0, -3, 0, 7, -3, -3, 0, 0, 0], [-1, 0, -6, 0, 3, 4, 3, 0, 0, 0], [5, 0, -4, 0, 0, -6, 1, 0, 0, 0], [0, -7, 0, 15, 0, 0, 0, 3, 0, -7], [0, -15, 0, 9, 0, 0, 0, -3, 9, -7], [0, 0, 0, 12, 0, 0, 0, 0, -3, 1], [4, 0, 4, 0, 5, 2, -1, 0, 0, 0], [-14, 0, 11, 0, 1, 6, 5, 0, 0, 0], [0, 13, 0, -5, 0, 0, 0, -4, 3, -8], [0, 2, 0, -8, 0, 0, 0, 2, -1, -1], [0, -13, 0, 10, 0, 0, 0, 0, 2, 0], [-13, 0, 6, 0, 3, -1, 1, 0, 0, 0], [8, 0, 5, 0, -4, 9, 3, 0, 0, 0], [7, 0, 6, 0, -1, -3, 4, 0, 0, 0], [-3, 0, 18, 0, -2, -6, 2, 0, 0, 0], [0, 2, 0, 5, 0, 0, 0, 4, -3, -8], [0, -12, 0, 5, 0, 0, 0, 5, 7, 0], [-16, 0, 7, 0, -3, -5, -2, 0, 0, 0], [0, 3, 0, -3, 0, 0, 0, 0, 1, 6], [-22, 0, -6, 0, 5, -5, -4, 0, 0, 0], [0, 2, 0, 8, 0, 0, 0, -3, 14, 1], [5, 0, -4, 0, 3, 7, 0, 0, 0, 0], [3, 0, -13, 0, 2, -2, 2, 0, 0, 0], [0, 3, 0, 9, 0, 0, 0, 0, -5, -8], [0, 1, 0, -15, 0, 0, 0, 0, 4, -3], [0, -8, 0, 2, 0, 0, 0, -4, 1, 6], [0, 0, -18, 0, 4, -5, 6, 0, 0, 0], [5, 0, -15, 0, 4, -5, 4, 0, 0, 0], [-12, 0, -3, 0, -5, 5, 0, 0, 0, 0], [0, -10, 0, -6, 0, 0, 0, -6, -3, -7], [0, 17, 0, -20, 0, 0, 0, -1, 1, 8], [-22, 0, -8, 0, 6, -2, 3, 0, 0, 0], [20, 0, 8, 0, 5, -1, 1, 0, 0, 0], [0, -1, 0, -6, 0, 0, 0, 0, 5, 2], [0, 7, 0, 14, 0, 0, 0, -5, -1, -11], [-23, 0, 18, 0, -6, 2, 1, 0, 0, 0], [0, 2, 0, 4, 0, 0, 0, -7, 1, 10], [0, 1, 0, 24, 0, 0, 0, -2, 0, -8], [5, 0, -10, 0, 0, 1, -10, 0, 0, 0], [0, 0, 0, -1, 0, 0, 0, 4, -9, -9], [0, 8, 0, 19, 0, 0, 0, 2, -9, 4], [0, 0, 0, -29, 0, 0, 0, -2, -9, -1], [2, 0, 11, 0, 0, -4, 3, 0, 0, 0], [-10, 0, 7, 0, 3, -1, 3, 0, 0, 0], [-4, 0, -4, 0, -2, -4, 8, 0, 0, 0], [0, -5, 0, 33, 0, 0, 0, 1, 3, 0], [5, 0, -7, 0, 3, -4, 0, 0, 0, 0], [0, -14, 0, -19, 0, 0, 0, -4, -2, -9], [0, 14, 0, 22, 0, 0, 0, 2, 9, 3], [0, 7, 0, 3, 0, 0, 0, -4, 10, 9], [1, 0, -14, 0, 2, 2, 10, 0, 0, 0], [0, 1, 0, 17, 0, 0, 0, -3, 15, 6], [0, 4, 0, -19, 0, 0, 0, 9, -2, -7], [2, 0, -12, 0, 8, -11, -4, 0, 0, 0], [0, -10, 0, -4, 0, 0, 0, -4, 7, -7], [11, 0, 1, 0, -2, 6, -6, 0, 0, 0], [0, 7, 0, -7, 0, 0, 0, 2, -10, -13], [0, 0, -9, 0, -6, -8, -13, 0, 0, 0], [-15, 0, 13, 0, -7, 2, -2, 0, 0, 0], [7, 0, -2, 0, -5, 8, 0, 0, 0, 0], [0, 3, 0, -10, 0, 0, 0, -9, 1, 3], [2, 0, -17, 0, 1, -7, 10, 0, 0, 0], [26, 0, 11, 0, 3, -5, -1, 0, 0, 0], [-28, 0, -3, 0, -5, 6, 2, 0, 0, 0], [-6, 0, 3, 0, -3, -8, 1, 0, 0, 0], [0, 1, 0, -14, 0, 0, 0, -3, -1, -5], [1, 0, -6, 0, -8, 11, 0, 0, 0, 0], [0, -8, 0, 6, 0, 0, 0, -8, 1, -3], [13, 0, -5, 0, -1, 17, 5, 0, 0, 0], [0, 9, 0, -16, 0, 0, 0, 3, -4, 1], [0, 1, 0, -10, 0, 0, 0, 6, -4, -9], [0, -1, 0, -5, 0, 0, 0, -3, 13, 12], [-13, 0, -1, 0, -3, 1, -13, 0, 0, 0], [0, 5, 0, -25, 0, 0, 0, -6, -2, 3], [0, 0, 0, -7, 0, 0, 0, -2, -4, 4], [-7, 0, -5, 0, -2, 3, -2, 0, 0, 0], [15, 0, -6, 0, -2, 13, 16, 0, 0, 0], [0, -7, 0, -24, 0, 0, 0, 3, -7, -3], [0, 15, 0, -3, 0, 0, 0, 4, 3, -4], [7, 0, 5, 0, 9, -1, -4, 0, 0, 0], [-17, 0, -8, 0, -1, -14, 3, 0, 0, 0], [0, 11, 0, -11, 0, 0, 0, -4, 7, 4], [0, -3, 0, -3, 0, 0, 0, -4, 14, 4], [8, 0, -9, 0, -2, -5, 9, 0, 0, 0], [0, -7, 0, -27, 0, 0, 0, 2, 0, -7], [0, 2, 0, -20, 0, 0, 0, -1, 2, -1], [0, -6, 0, -9, 0, 0, 0, -5, 4, -10], [13, 0, 13, 0, -9, -4, 7, 0, 0, 0], [-6, 0, 4, 0, 2, -14, 1, 0, 0, 0], [0, -7, 0, -7, 0, 0, 0, 3, -15, -3], [-3, 0, -10, 0, 1, -1, 14, 0, 0, 0], [-4, 0, -7, 0, 5, -2, -2, 0, 0, 0], [0, -13, 0, 16, 0, 0, 0, 8, 0, -3], [-4, 0, -14, 0, 9, -5, -5, 0, 0, 0], [0, 12, 0, -9, 0, 0, 0, -2, -13, 1], [-2, 0, -2, 0, -2, -5, -13, 0, 0, 0], [19, 0, -7, 0, 0, 1, -4, 0, 0, 0], [0, -18, 0, 13, 0, 0, 0, 7, 4, -3], [13, 0, 1, 0, 2, 1, -3, 0, 0, 0], [0, 13, 0, -2, 0, 0, 0, 9, -5, 8], [0, -9, 0, 0, 0, 0, 0, -4, 5, -5], [18, 0, 6, 0, -7, 3, 10, 0, 0, 0], [-12, 0, 10, 0, 1, 1, -1, 0, 0, 0], [0, -7, 0, 23, 0, 0, 0, 7, 1, -6], [21, 0, 9, 0, -2, -10, 7, 0, 0, 0], [0, 3, 0, -15, 0, 0, 0, 6, 4, -6], [0, 1, 0, -7, 0, 0, 0, -3, 1, 6], [-31, 0, 0, 0, 6, -8, -2, 0, 0, 0], [-5, 0, 3, 0, -12, 6, 12, 0, 0, 0], [23, 0, -4, 0, -8, 9, 12, 0, 0, 0], [0, 2, 0, -30, 0, 0, 0, -6, 1, 1], [0, 7, 0, 23, 0, 0, 0, 5, 7, 5], [17, 0, -11, 0, 3, -5, -10, 0, 0, 0], [0, 5, 0, -20, 0, 0, 0, -7, -8, -5], [-8, 0, -11, 0, 11, 2, -9, 0, 0, 0], [0, -1, 0, 32, 0, 0, 0, -5, 5, 6], [-30, 0, -6, 0, -5, -5, 0, 0, 0, 0], [0, 6, 0, -16, 0, 0, 0, -3, -6, -3], [-24, 0, -10, 0, 7, -2, -4, 0, 0, 0], [9, 0, 7, 0, -1, 14, 7, 0, 0, 0], [-14, 0, 1, 0, 9, -9, -10, 0, 0, 0], [0, 4, 0, 28, 0, 0, 0, -1, -3, 1], [0, 11, 0, 1, 0, 0, 0, 6, -3, 5], [23, 0, -5, 0, 4, -1, -3, 0, 0, 0], [0, -1, 0, 13, 0, 0, 0, 4, 8, 3], [-2, 0, -8, 0, 2, -11, -4, 0, 0, 0], [29, 0, -1, 0, -9, 9, -5, 0, 0, 0], [0, 3, 0, 6, 0, 0, 0, 3, 10, 3], [-27, 0, 4, 0, 0, 11, 4, 0, 0, 0], [0, 20, 0, -18, 0, 0, 0, -7, 10, 7], [-4, 0, -2, 0, 4, -5, -10, 0, 0, 0], [0, -5, 0, -10, 0, 0, 0, 4, -11, -5], [-6, 0, 15, 0, 4, -18, 2, 0, 0, 0], [0, 11, 0, 29, 0, 0, 0, 7, -11, -3], [-14, 0, -8, 0, 6, -9, -18, 0, 0, 0], [0, 0, 8, 0, -2, 13, 5, 0, 0, 0], [0, 5, 0, -29, 0, 0, 0, 6, -9, -1], [0, 24, 0, 16, 0, 0, 0, 7, -2, 4], [-10, 0, 11, 0, 5, 8, 1, 0, 0, 0], [0, -6, 0, 0, 0, 0, 0, -4, -3, 1], [9, 0, 5, 0, 8, -17, -7, 0, 0, 0], [0, -4, 0, -14, 0, 0, 0, 6, 0, 3], [-9, 0, 9, 0, 6, 10, -5, 0, 0, 0], [22, 0, 11, 0, 11, 12, 3, 0, 0, 0], [0, 5, 0, 23, 0, 0, 0, 4, 2, 8], [0, -13, 0, -23, 0, 0, 0, -8, 16, 9], [0, -8, 0, -3, 0, 0, 0, 3, 5, 11], [0, 20, 0, 3, 0, 0, 0, 6, 3, 1], [0, 25, 0, -13, 0, 0, 0, 2, -11, 10], [-18, 0, 2, 0, -7, 5, -7, 0, 0, 0], [0, -5, 0, -5, 0, 0, 0, -1, 6, -9], [0, -9, 0, -39, 0, 0, 0, -6, 13, 4], [-22, 0, -20, 0, 1, -1, 11, 0, 0, 0], [19, 0, -5, 0, 2, 1, -5, 0, 0, 0], [17, 0, 11, 0, 6, 6, 8, 0, 0, 0], [0, 2, 0, 12, 0, 0, 0, 11, -4, -2], [0, 0, 0, -12, 0, 0, 0, 13, -5, -6], [-7, 0, -3, 0, -1, -15, -22, 0, 0, 0], [0, -6, 0, 10, 0, 0, 0, 4, 8, 0], [0, 13, 0, -2, 0, 0, 0, -3, -6, 10], [24, 0, -4, 0, -2, 9, 7, 0, 0, 0], [0, 6, 0, -11, 0, 0, 0, -12, 15, 6], [0, -11, 0, 4, 0, 0, 0, -8, 1, 10], [0, 13, 0, 44, 0, 0, 0, 1, -9, 0], [-7, 0, -8, 0, 9, 6, 2, 0, 0, 0], [4, 0, 5, 0, -15, 17, 14, 0, 0, 0], [20, 0, 11, 0, 11, 3, -3, 0, 0, 0], [0, 19, 0, -31, 0, 0, 0, 4, -5, 10], [-4, 0, 6, 0, 10, -11, 1, 0, 0, 0], [0, 8, 0, 7, 0, 0, 0, -9, -7, -18], [22, 0, -10, 0, 1, -13, -8, 0, 0, 0], [0, 9, 0, -17, 0, 0, 0, 15, -4, 6], [29, 0, 2, 0, -6, 6, -11, 0, 0, 0], [0, 4, 0, -35, 0, 0, 0, 8, -6, -1], [0, 1, 0, -40, 0, 0, 0, 3, -2, -20], [-17, 0, 21, 0, 0, 15, 9, 0, 0, 0], [23, 0, 5, 0, 11, -2, -3, 0, 0, 0], [-27, 0, 0, 0, 8, 5, 11, 0, 0, 0], [0, 23, 0, 22, 0, 0, 0, 5, -12, -9], [0, -14, 0, -7, 0, 0, 0, -12, 12, 12], [-7, 0, -7, 0, -12, 18, 5, 0, 0, 0], [0, 6, 0, -10, 0, 0, 0, 1, 0, 11], [6, 0, -6, 0, -7, 4, -3, 0, 0, 0], [-22, 0, 0, 0, -1, -9, 8, 0, 0, 0], [0, -4, 0, 1, 0, 0, 0, -17, -7, 6], [-45, 0, -3, 0, -7, 4, 7, 0, 0, 0], [0, 16, 0, -36, 0, 0, 0, 1, 4, 4], [0, -1, 0, 3, 0, 0, 0, -3, 16, 5], [0, 17, 0, 7, 0, 0, 0, 0, 14, 8], [15, 0, -19, 0, -3, -9, 1, 0, 0, 0]];
    aps := ConvertToHeckeField(raw_aps);
    chi := MakeCharacter_2900_c_Hecke( : Kf := Universe(aps));
    return ExtendMultiplicatively(weight, aps, chi);
end function;


// To make the newform (type ModFrm), type "MakeNewformModFrm_2900_2_c_i();".
// 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_2900_2_c_i(:prec:=10)
    chi := MakeCharacter_2900_c();
    f_vec := qexpCoeffs();
    Kf := Universe(f_vec);
    // SetVerbose("ModularForms", true);
    // SetVerbose("ModularSymbols", true);
    S := CuspidalSubspace(ModularForms(chi, 2));
    S := BaseChange(S, Kf);
    maxprec := NextPrime(1999) - 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_2900_2_c_i();".
// 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_2900_2_c_i( : sign := -1)
    R<x> := PolynomialRing(Rationals());
    chi := MakeCharacter_2900_c();
    // SetVerbose("ModularSymbols", true);
    Snew := NewSubspace(CuspidalSubspace(ModularSymbols(chi,2,sign)));
    Vf := Kernel([<3,R![9, 0, 75, 0, 163, 0, 99, 0, 18, 0, 1]>,<7,R![169, 0, 2666, 0, 1705, 0, 364, 0, 32, 0, 1]>],Snew);
    return Vf;
end function;