
// Make newform 7942.2.a.bo in Magma, downloaded from the LMFDB on 25 April 2024.
// To make the character of type GrpDrchElt, type "MakeCharacter_7942_a();"
// To make the coeffs of the qexp of the newform in the Hecke field type "qexpCoeffs();"
// To make the newform (type ModFrm), type "MakeNewformModFrm_7942_2_a_bo();".
// 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_7942_2_a_bo();".
// 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 := [-5, 30, -36, -50, 64, 29, -14, -3, 1];
        Kf := NumberField(Polynomial([elt : elt in poly]));
        AssignNames(~Kf, ["nu"]);
    end if;
    Rf_num := [[1, 0, 0, 0, 0, 0, 0, 0], [0, 1, 0, 0, 0, 0, 0, 0], [-35, 91, 91, -159, -83, 36, 10, -3], [111, -343, -191, 531, 167, -108, -18, 7], [-97, 369, 129, -685, -193, 140, 22, -9], [33, -133, -57, 213, 69, -44, -8, 3], [39, -129, -59, 213, 69, -44, -8, 3], [583, -1695, -1047, 2747, 951, -572, -106, 39]];
    Rf_basisdens := [1, 1, 8, 8, 8, 2, 2, 8];
    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_7942_a();"
function MakeCharacter_7942_a()
    N := 7942;
    order := 1;
    char_gens := [5777, 6139];
    v := [1, 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;

function MakeCharacter_7942_a_Hecke(Kf)
    return MakeCharacter_7942_a();
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 := [[-1, 0, 0, 0, 0, 0, 0, 0], [1, -1, 0, 0, 0, 0, 0, 0], [0, -1, 0, -1, 0, 0, 0, 0], [0, 0, 0, 0, 0, 0, 1, 0], [-1, 0, 0, 0, 0, 0, 0, 0], [0, 0, 0, -1, 0, 1, 1, 0], [0, 0, 0, 2, -1, 0, 0, 0], [0, 0, 0, 0, 0, 0, 0, 0], [1, 0, 0, 0, 1, 1, 0, -1], [0, 1, 0, 1, -1, 1, 0, -1], [1, 0, 1, 0, 1, 0, -1, 0], [-2, 1, 1, 0, -1, 0, 0, -1], [5, 0, -1, 2, -1, 0, 1, -1], [1, -1, -1, -1, 1, 0, 1, -1], [0, 2, 3, 1, 1, -1, 0, 1], [7, 0, -1, 1, -2, 0, -1, 1], [1, 1, 0, -4, 2, 0, 0, 2], [0, -3, -1, 0, -2, 0, -1, 2], [-1, 0, 0, -3, 2, -1, 0, 1], [1, -1, 1, -2, 2, 1, 3, 1], [-1, 1, 3, 2, -2, 0, 0, 2], [3, -1, 1, 4, -2, -2, 1, -1], [3, 1, 2, 3, 1, 0, 0, -2], [2, 0, 1, 1, 1, -1, 1, 0], [7, 3, 0, 2, -1, 1, 0, -2], [-3, 2, -2, 3, -4, 0, -3, -2], [1, -3, -3, 2, 0, 0, -3, -1], [7, -2, -3, 1, 0, 0, 2, 0], [0, -1, 3, 3, 0, -1, 0, 1], [-3, 0, 1, -6, -2, 1, 0, 0], [3, -2, -2, 2, -1, -2, 0, 1], [1, -2, 0, 0, -1, -1, 3, 1], [-6, -2, 1, -1, 1, -1, 2, 0], [-10, -1, -3, -1, -2, 0, 0, 0], [-3, -1, -1, -7, 4, 2, -1, -1], [-8, 2, 3, -8, 2, -1, -1, 1], [5, -1, 1, 0, 1, -1, 2, -3], [-4, 0, 2, 3, 1, 0, -1, 2], [14, -2, 0, 0, 0, -1, 1, 0], [10, 1, -2, 6, -3, -4, -1, 0], [3, 0, 3, 2, 1, 0, 4, 0], [-3, 1, 0, 2, -2, 2, 0, 0], [-4, 3, 5, 2, -3, 0, 2, 2], [0, 2, 2, 1, -1, 0, -2, 2], [7, 3, 4, 6, 1, 0, 3, 2], [0, -2, -3, 3, -5, 0, -1, -1], [9, -6, -3, -1, 0, -2, 1, -2], [11, -5, 0, 5, 1, -2, -1, -2], [3, -2, -3, 4, 1, 0, -4, -4], [-3, 0, -1, -1, -2, -2, -1, -3], [-1, -4, 0, -10, -2, 0, 1, 1], [6, -2, -3, 11, -3, 2, 0, -3], [-1, -1, 2, 1, 3, 1, -1, -2], [4, 4, -2, 2, 2, 0, 1, 2], [1, 1, 1, -3, 1, 3, -3, 0], [-1, -3, 1, -7, -1, -2, -4, 1], [7, 1, -1, 0, -1, 2, 2, -1], [-10, -3, 0, -3, -2, -4, 4, 1], [-6, 6, -2, 3, 1, 1, -4, -3], [2, 0, 3, -5, -2, 0, -1, 1], [0, 1, 4, -10, 3, 1, 5, -1], [0, -4, -2, -2, 0, 1, 0, 4], [0, 1, 0, 9, -4, 0, -1, -1], [-1, 2, -3, 5, -4, -2, 3, 0], [-10, 1, -3, -5, 0, 1, -2, 1], [6, 3, 4, 1, 4, 1, -1, 0], [5, -6, 2, 5, 2, -1, 0, 3], [1, -5, -2, 1, -1, 1, 5, -1], [-9, 2, 0, -9, 2, 2, -4, -1], [1, 5, 2, 4, 3, 4, -1, 4], [1, -2, -2, 3, -3, -2, -2, -1], [6, 3, 2, 14, -1, 0, -1, -3], [0, 2, 3, 4, 2, 4, -1, -3], [0, -2, -7, -2, -1, 0, -5, -1], [1, 1, 3, -6, 0, 0, 2, -3], [-8, 1, 5, 6, 3, -2, 5, 4], [-7, -2, -2, -4, -4, 3, 3, -1], [-2, 0, -1, -11, -1, 1, -4, 3], [9, 4, 4, 4, 3, 0, 3, 1], [-12, 3, 4, -9, 0, 4, -1, 2], [5, 4, 9, 7, 2, 1, 0, 0], [3, -2, -1, -1, 6, 1, 3, 3], [6, 0, -4, -4, -2, -4, -3, 2], [1, 8, 3, 3, -2, 3, 0, -1], [7, -2, -1, 2, -5, 0, 3, 2], [0, 9, 4, 12, 1, 2, -4, 3], [-9, -3, -6, -12, -5, 0, 1, 2], [-10, 4, -4, -7, -3, -2, 1, 1], [7, -3, -1, -5, -1, -2, 1, -3], [-3, 4, -4, -2, 3, -2, -5, 3], [17, -7, -5, 3, -1, -2, 5, 1], [-7, 8, 1, 11, 2, 3, 2, 0], [5, 3, 8, 4, 0, 0, 2, 0], [-4, -5, -1, 1, -2, 4, 6, -4], [-2, -2, -1, 1, -5, -3, -5, -1], [-8, 3, -6, 4, -1, -1, -2, -5], [14, -6, -6, 4, 3, -1, 0, -2], [3, 6, -1, 3, 1, -2, 0, -2], [-9, 2, 0, -2, 3, -1, -5, -5], [-13, 4, 2, -12, 8, 0, 0, 3], [-8, 4, 5, 9, -1, -2, -5, 1], [-10, 9, 4, -5, 2, -1, 1, -1], [1, 3, 6, 1, -5, 0, 3, 2], [12, 1, -5, 6, -5, 1, 5, -1], [12, -3, -1, 13, 0, 4, 0, 2], [1, 1, 3, 2, 5, -2, 7, -3], [-13, 6, 0, -16, -3, 0, 1, -1], [-6, 2, 1, 5, -1, -4, 0, 0], [-4, -4, 0, -18, 2, 0, 1, 0], [-8, 1, -5, -4, -5, 3, 0, -4], [-10, 6, -6, 0, -4, 2, 0, -2], [10, 7, 1, 4, 1, 2, -4, 3], [-9, -3, -1, -12, 2, -5, 0, 1], [9, 6, 0, -5, 0, 2, 4, 5], [7, 0, 1, 7, 0, -2, 6, 2], [7, -3, 3, -1, 0, -2, 7, -1], [13, 9, 1, 8, 6, -4, 3, -1], [6, -5, -4, 2, -1, -5, -7, 3], [-5, -2, -6, -1, -2, -2, -4, 4], [-6, 3, 8, -4, 1, -2, 4, 7], [1, 0, 2, 0, 3, -3, 5, -1], [6, 2, -2, 5, -5, 3, -1, 3], [-11, 0, 3, -21, 9, 4, -3, -2], [18, -6, 6, 1, -1, -4, 4, 2], [1, 2, 3, -8, -1, -3, 7, 0], [6, -1, -8, 1, -4, -5, -6, 2], [6, -1, -5, 6, 0, 1, -1, -6], [-6, 6, 6, 7, 5, -1, 1, 6], [-1, -3, 0, -3, 7, 3, 5, 0], [-10, -1, -2, -12, -6, 5, -5, 1], [3, 2, 1, -2, -5, -4, -3, 0], [-12, 1, -9, 4, 1, -4, 0, -6], [5, -2, -5, 11, -8, 1, -4, 0], [-4, 6, 10, 7, 0, 4, -1, 4], [-7, 8, 3, -6, -3, -1, -5, 0], [-2, -5, -10, -23, 0, 0, -1, -4], [-11, 8, 1, -3, -5, 2, 1, 0], [-13, 2, 5, 8, 1, -3, -5, 4], [9, -8, 2, -9, -3, -5, -1, 5], [6, -8, -3, -10, 0, -3, 0, -2], [-3, 2, 4, -9, 0, -4, 3, 1], [17, -6, -4, 16, 4, 3, 4, 1], [9, 3, 6, 2, -6, -2, 3, 2], [-3, 9, -6, -5, -1, 0, 1, 0], [-1, 1, 4, -1, 5, 3, -7, 5], [3, -5, 7, 10, 4, -1, 6, 5], [6, 3, -4, -9, -1, 3, 2, 3], [-1, 2, -2, -8, 4, 4, -7, 1], [-1, 3, 8, -18, 8, 3, 7, -2], [-1, -12, -1, 2, -3, 3, -1, -4], [0, 0, 0, -17, 0, 2, 0, 4], [-5, -1, 1, -9, -1, 7, 5, -2], [-2, 5, 5, 3, -4, 4, 8, -6], [5, -1, -4, -14, 6, 0, 5, -4], [3, -5, -1, -3, -3, -2, -7, 5], [-3, -10, -7, -1, 8, 2, 1, -2], [6, 9, -1, -11, -2, -1, -5, 0], [-3, -4, -2, -16, 2, 2, 4, 1], [-3, 9, 0, -11, 3, 3, 5, 0], [-13, 12, 1, -1, -2, 0, -1, -4], [5, -3, 6, -11, 9, 1, -9, 4], [-1, -4, -9, 6, -8, 1, -4, -4], [4, -10, -1, -15, 1, 1, 8, -3], [2, -10, -7, -11, 7, 1, 0, -7], [21, 4, 3, -1, 6, -2, -5, 3], [4, 7, 3, 1, 2, -5, -1, 0], [-31, 3, 4, -11, -5, 1, 0, 0], [3, -8, -2, 6, 5, 3, -2, 2], [1, 0, -8, -6, -2, 4, 6, -1], [-4, -12, -4, -10, -5, -6, 4, 0], [-8, -14, -2, -17, -1, -2, -8, 0], [-19, 6, -7, -9, 2, 4, -7, 0], [-6, -1, -3, -6, 3, -1, -2, -4], [28, 4, 1, 15, 1, 0, -2, 0], [16, 1, -1, 8, 1, 0, 7, -6], [8, -12, -13, -7, 0, -3, -5, 3], [14, 2, 11, 1, -1, -4, 7, -1], [32, -3, -1, 21, -7, 1, 2, -2], [10, -4, 8, -4, 2, -1, 5, 6], [10, -5, -6, 11, 7, 0, 3, -7], [16, -5, 9, 17, -6, -4, 14, 2], [-5, 9, 10, 2, 6, 2, 7, -6], [-4, 7, -3, 20, -6, 2, 1, -2], [17, 9, 9, 7, 3, -3, -3, 0], [14, 0, -5, 25, -3, 1, -2, -3], [-5, 2, 10, -1, 2, -4, -2, 0], [0, 2, -1, -3, -3, -3, -8, -6], [-7, 8, -1, 0, -3, 4, -11, 2], [-4, 7, 1, 15, 7, 3, 4, -2], [-9, 0, 1, -29, 8, 2, -4, 2], [-4, -5, 2, 14, 5, 1, 1, 0], [-5, 1, -11, -8, 4, 0, -3, -3], [1, -1, -3, 18, -6, -6, -2, -3], [-2, 8, -1, 1, -7, -5, -5, 2], [26, -3, 1, 10, -7, -4, 1, -2], [7, 10, 1, 2, 5, 4, -12, -2], [1, -6, -6, -6, 2, -3, 6, -1], [28, 0, 4, 5, -1, -3, 10, 3], [9, 2, -3, 12, 0, 2, -4, -6], [-23, -9, -7, -32, -4, 1, 1, 1], [10, -1, 7, -13, 5, 2, 7, 2], [12, 4, 11, 7, 9, 5, 0, 3], [1, 5, -1, 2, -1, 3, 0, 1], [-6, 1, 8, 8, 2, 4, 9, -3], [-2, 7, -9, -19, 0, 2, -5, -2], [8, -7, -5, 4, -3, -4, 5, 5], [-16, 1, 0, 7, 6, 4, 0, -1], [-8, -3, 2, -10, -9, -1, -4, 5], [-5, -8, 0, -6, 5, -3, -7, 4], [10, 6, 1, 7, -3, -1, 8, 5], [29, -10, -10, 16, -5, 2, 3, 2], [12, 1, 9, 2, 3, 2, 6, 3], [19, -5, 6, 12, 2, -6, -2, -4], [3, 1, 8, -8, 8, 0, 9, 0], [7, -4, 0, -6, -3, -4, -7, 9], [-11, 3, 2, 8, -1, 0, -12, 2], [1, 2, 1, 12, 7, -5, -1, -2], [-5, 5, 3, 13, 6, 10, 1, -1], [14, -3, -6, -2, -3, -6, -9, 3], [-20, 3, 9, -1, -4, 2, -4, 9], [-11, -3, -9, 1, -1, -1, -2, 7], [10, -11, -1, -4, 15, -4, 5, 0], [-9, 7, -9, -1, 2, 2, -8, 5], [-22, 11, 4, 4, 1, -1, -13, -1], [7, 5, -7, -1, 5, 6, 4, 5], [-2, 2, 9, -12, -8, 1, -5, -4], [17, -1, -3, -27, 2, -1, 0, 1], [-7, 1, 2, 4, 2, 1, -8, 0], [-30, 2, -4, -1, -3, -2, -5, 0], [9, -1, 9, -23, 3, -5, 3, 5], [-4, 1, -7, 22, 1, -2, -6, -2], [2, 4, -7, 18, 4, 6, -1, -1], [-29, 11, -7, -9, -1, -3, -3, -5], [3, 11, -1, 26, -2, 2, -5, 7], [8, -8, 2, 4, -8, 6, 4, -2], [-2, -15, -9, -12, -5, -4, -8, -4], [-34, 6, 4, 2, 3, 0, -3, 0], [-9, 7, 6, -6, -6, -2, 5, 6], [-24, 6, 9, 5, 5, 1, -4, 3], [7, 9, -2, 4, -4, -10, -9, 2], [2, -3, -6, 22, -3, 5, -3, -1], [-11, 9, -2, 14, -8, -2, -3, 0], [-22, 0, -10, -41, -1, 0, -2, -4], [-4, 10, 1, 19, -5, 4, -9, -4], [12, -3, -6, -4, -8, -3, 2, 5], [7, -9, -6, -16, 6, -2, 3, 4], [-6, -10, -5, 2, 6, 0, -3, 3], [-9, 3, 1, -2, -12, 4, -6, -1], [-5, -9, 1, 12, -10, -4, -4, -9], [11, -3, -2, 20, 8, -2, 4, -2], [-19, 6, 1, -7, -10, -2, -3, 1], [2, -16, 2, 5, 5, -5, 1, 7], [23, -13, 3, -4, 2, -5, 0, 5], [-26, -1, 4, -7, 7, 1, 0, 3], [-14, -13, 3, 9, -2, 1, 2, 4], [-14, 11, 7, -9, 10, -4, -7, 2], [-19, -11, -2, -27, 5, -6, 2, 11], [2, -6, -7, 8, 4, -2, -1, 5], [-6, 3, -2, 10, -7, 3, -13, 3], [11, -1, -2, 15, 9, -6, 4, -2], [-24, 9, 6, -7, 4, 5, -1, 5], [-37, -5, 5, 2, -4, 1, -5, 3], [41, 10, 3, 15, 10, 5, -8, 2], [-1, 13, 11, 2, 4, 1, -4, -11], [-6, 6, 11, 27, 6, -2, 5, 7], [-23, 8, 5, -14, -9, 0, 1, 0], [25, -7, -6, 16, 8, -1, 6, -2], [2, 1, 1, -12, -12, -3, -7, 2], [-29, 7, 7, -4, -10, 0, -3, 5], [-4, -7, 1, 8, -9, -6, 0, 6], [24, 12, 12, 21, 7, 1, -3, 5], [-22, -3, -6, -15, 2, 5, 2, 3], [14, 2, 2, 1, 8, -1, 3, 6], [23, -4, 3, 14, 5, -2, -1, 4], [-14, -15, -5, -26, 1, -7, 1, 9], [-6, -2, -7, 3, 1, 11, -9, 1], [33, -11, -12, 9, 13, -4, 2, 2], [-4, -17, -3, -5, -4, -1, -2, -5], [-10, -7, -3, 9, -11, -1, -8, -2], [-1, -3, -3, -8, 0, 4, 7, -7], [25, 6, 9, 9, -2, 9, 4, -2], [-17, -7, 1, -22, 14, -4, -3, 1], [3, -3, 2, -12, -4, 1, 1, -2], [-10, 2, -7, -12, -1, 5, 4, 9], [23, -3, -10, 25, 7, -3, -1, -6], [-14, 3, -16, -18, 3, 7, -8, -1], [26, 1, -10, -16, 3, 2, 13, -6], [-18, 5, -2, -5, -1, -4, 6, 3], [11, -6, -1, 1, 4, -3, 7, 6], [-4, 3, 4, -10, -1, -8, 7, -5], [29, 3, 4, 8, 1, 2, 1, -8], [-36, 4, 2, -2, 2, -1, -9, -2], [0, 7, 1, 27, -16, 2, -6, -1], [-24, 13, -4, 11, -6, -4, -5, 3], [4, 2, -3, 2, -5, 5, -3, 3], [-34, 11, 6, -5, -2, 3, -12, 0], [1, 9, 5, -1, -1, -6, 4, -9], [7, 6, 0, 14, 5, -1, 6, -7], [10, -7, -2, 2, 5, -5, -8, -1], [-3, -15, 4, -13, -1, 3, 14, 2], [-4, 5, 16, 5, 4, -2, -9, 10], [4, 0, 3, -5, -8, 8, 3, -1], [-16, 3, 8, -24, -5, -1, -5, 5], [13, -10, -7, 5, 2, -5, 9, -6], [-28, -1, 8, 12, -1, -9, -12, 1], [25, 6, 4, 9, 1, -4, 1, -7], [1, 17, -5, -2, -4, -7, 0, -7], [-24, 0, 2, 8, -8, 2, -8, 3], [-11, -7, -4, 0, 2, 3, 8, 2], [-7, -3, -15, -17, -1, 0, 1, -10], [-13, 15, 3, 20, 2, 2, -12, 1], [16, -13, -7, 19, 2, 3, -6, -4], [-35, 15, 5, -30, 10, -2, -5, -2], [4, -4, -2, 14, -2, 0, 20, -6], [-18, 16, 5, -4, -6, 2, 5, -1], [-15, 9, 9, -10, 3, -4, -9, 7], [27, -4, -7, -5, -12, -4, -9, 6], [3, -18, -10, -18, -9, -7, 9, 9], [-34, 16, 5, -17, 0, -1, -2, -1], [-15, 3, 3, -10, -10, 6, 1, -2], [-18, 16, 4, -18, 4, -5, -2, 14], [-3, -4, -3, 15, -13, -3, -2, 4], [-28, 1, 8, -32, 13, 0, 7, 0], [2, 2, -11, -10, -10, -2, -7, 5], [-1, 11, -3, 19, -1, 13, -8, -6], [1, -8, -5, -2, -10, -12, -7, 2], [-29, 15, 8, 19, 3, 8, -3, -6], [16, 5, -1, -1, -10, 1, -11, -6], [-15, 14, 9, -13, 4, 0, 6, -6], [2, 5, -3, -2, 2, 5, 4, 10], [27, -6, -9, 4, 5, -5, -5, 1], [29, 1, 0, 9, 7, 1, 9, 0], [-37, 5, 0, -1, 1, 5, -17, -4], [2, 4, 0, 0, -14, -1, 8, 10], [-30, 5, 1, -15, 6, 4, -9, 6], [11, -1, 1, 13, -3, 10, -7, 7], [29, 1, 9, -13, 6, 0, 0, -1], [-17, -5, 4, -6, 4, -4, -15, 3], [5, 18, 5, 21, 3, 0, -17, 2], [9, -16, -5, -22, -9, 0, -1, -6], [-13, 9, -8, 12, 2, -4, -15, -2], [-6, -18, 1, 0, 10, -4, -2, 3], [-1, -19, -2, -23, 9, -8, 2, 4], [1, 20, 1, -4, 5, -8, 0, 0], [-6, 14, 1, -6, 17, 0, -1, 1], [-18, 5, 12, -7, -6, -10, 0, 5], [7, 18, 6, 18, 7, 0, -15, 4], [-18, -14, -12, -11, -1, 3, 12, -8], [6, -2, -3, -9, 5, -1, 1, 1], [20, 9, 3, 9, 1, -8, -7, 6], [3, 1, 13, -15, -5, -1, -8, 9], [15, 4, -3, -5, 12, 4, 5, -1], [26, -5, 7, 2, 4, 1, 0, 2], [-18, -4, -6, -9, 15, 1, 3, -4], [-21, -5, 4, -1, -2, 4, 5, -6], [14, 19, 15, 40, 5, 9, -3, 3], [-31, 11, 11, -15, 3, -1, 0, -1], [11, -5, -11, 15, 3, 3, -10, -9], [-24, -11, 4, -11, 4, 9, -3, 6], [41, 9, 4, 15, 11, -1, -7, 2], [19, 13, 3, 41, 0, 1, 6, -5], [28, -5, -2, 11, 1, -5, 7, -5], [22, -17, -10, 15, -10, 2, -4, 1], [19, 10, 7, 30, -5, 2, 6, 2], [35, -14, -16, -11, 8, -5, 14, -1], [4, -7, -8, 18, -2, -2, 2, -5], [10, -6, -9, -12, 2, -3, -16, 9], [-50, -2, -5, -23, 7, 6, -6, 3], [-3, 9, -6, 25, 0, 6, -10, -12], [-13, 9, -8, -18, 10, 6, -10, 0], [-14, 1, 9, -4, -9, -3, 5, -6], [-30, 15, -8, 1, 4, 12, 0, -5], [26, -3, 4, 2, -1, -6, 7, -9], [24, -9, 4, 6, 5, 0, 1, 9], [-6, 5, 9, 17, 3, -9, 1, 2], [14, -9, 14, 6, -1, 0, -2, 9], [13, 16, -7, -21, -6, -4, -4, -4], [-10, 9, 10, 8, 8, 12, -4, -1], [-4, 14, 5, 10, -8, 5, -2, 6], [-7, -1, -11, -21, 0, -9, 3, 1], [26, 11, -1, -16, 4, 0, 11, 6], [2, 1, 2, -42, 1, -1, 11, 2], [6, -1, 2, -3, 0, -7, 5, -7], [-19, 10, 7, -14, -11, -3, -5, -5], [1, -11, -15, -15, 9, -7, 5, -1], [14, 10, -2, 0, 8, 6, -13, -2], [-1, 9, -6, 0, 0, 10, -10, -10], [24, 12, -4, -1, -10, 6, -3, 4], [2, 1, -10, -4, -9, 11, -7, -1], [18, 3, -10, -36, -3, 5, -2, -7], [28, -14, -4, 5, -12, 3, 5, 2], [-42, 20, -3, 9, -3, 3, 1, -4], [20, 0, -4, 17, 3, 11, -7, -4], [-21, 14, 11, 11, -2, 7, -1, 2], [23, 4, 21, -8, -5, -1, 7, -2], [-6, -6, -14, -27, 6, 2, -2, 2], [14, -9, -7, 0, 17, -4, -5, 0], [-1, -11, -20, -7, -15, -1, -12, -2], [-2, 16, 22, 1, 17, -1, 0, 0], [-3, -7, 11, -20, -5, 8, 1, -3], [37, 2, -2, 37, 10, -4, 8, 0], [-16, -8, -1, 7, -3, -2, 18, 2], [-19, 10, -6, 2, -7, -4, 1, -9], [49, -2, 2, 14, -4, 2, 11, 3], [-15, -16, -14, -3, 4, 12, 5, -2], [0, -9, 1, -11, -10, 1, 1, 6], [-24, 16, -1, -8, -11, 2, -8, -5], [18, 13, 11, 7, 7, 1, -10, 4], [-3, 8, 5, -8, 5, -11, 8, 8], [-34, -8, -4, -13, 7, 7, -5, -2], [1, 15, 17, -7, 6, 2, 8, 1], [13, -21, -6, 0, -3, -4, 8, -2], [10, -6, -11, -6, 10, -4, -10, 5], [-11, 8, 13, 4, -15, 0, -1, 0], [-8, -6, -9, -11, -3, 2, -14, 4], [1, 13, -1, -14, 2, 7, -10, -5], [6, -1, 11, -2, 7, 3, 12, 10], [15, 12, -3, -9, 0, 1, 0, 14], [4, 11, 8, -18, 5, 3, 6, -4], [13, -13, 8, -19, -1, -4, -1, 0], [3, -19, -3, -34, 13, -2, 14, -3], [-9, 1, -7, -16, -4, 0, 6, 6], [12, 4, -10, 0, 4, 7, -20, -2], [29, 6, -2, 1, 6, 8, 0, 3], [14, 5, -2, -36, 7, -4, -12, 12], [2, 21, 17, 21, 6, 0, -3, -1], [56, -6, 20, 10, 4, -12, 7, 2], [-2, -3, -5, 9, 2, -3, -8, -13], [14, -1, -3, 2, -1, 7, 3, -8], [-22, -7, 3, 6, -3, 3, -8, 8]];
    aps := ConvertToHeckeField(raw_aps);
    chi := MakeCharacter_7942_a_Hecke(Universe(aps));
    return ExtendMultiplicatively(weight, aps, chi);
end function;


// To make the newform (type ModFrm), type "MakeNewformModFrm_7942_2_a_bo();".
// 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_7942_2_a_bo(:prec:=8)
    chi := MakeCharacter_7942_a();
    f_vec := qexpCoeffs();
    Kf := Universe(f_vec);
    // SetVerbose("ModularForms", true);
    // SetVerbose("ModularSymbols", true);
    S := CuspidalSubspace(ModularForms(chi, 2));
    S := BaseChange(S, Kf);
    maxprec := NextPrime(2999) - 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_7942_2_a_bo();".
// 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_7942_2_a_bo( : sign := -1)
    R<x> := PolynomialRing(Rationals());
    chi := MakeCharacter_7942_a();
    // SetVerbose("ModularSymbols", true);
    Snew := NewSubspace(CuspidalSubspace(ModularSymbols(chi,2,sign)));
    Vf := Kernel([<3,R![16, -112, 243, -167, -36, 62, -7, -5, 1]>,<5,R![-19, 74, -27, -106, 74, 23, -20, -1, 1]>,<13,R![2911, 23004, -7689, -4374, 1342, 241, -72, -3, 1]>],Snew);
    return Vf;
end function;