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Properties

Label 16.0.48077715560...0000.1
Degree $16$
Signature $[0, 8]$
Discriminant $2^{16}\cdot 3^{8}\cdot 5^{8}\cdot 17^{15}$
Root discriminant $110.31$
Ramified primes $2, 3, 5, 17$
Class number $1117712$ (GRH)
Class group $[2, 2, 2, 139714]$ (GRH)
Galois group $C_{16}$ (as 16T1)

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Show commands for: Magma / SageMath / Pari/GP

magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(R![43569140625, 0, 34855312500, 0, 8132906250, 0, 852018750, 0, 47334375, 0, 1491750, 0, 26775, 0, 255, 0, 1]);
 
sage: x = polygen(QQ); K.<a> = NumberField(x^16 + 255*x^14 + 26775*x^12 + 1491750*x^10 + 47334375*x^8 + 852018750*x^6 + 8132906250*x^4 + 34855312500*x^2 + 43569140625)
 
gp: K = bnfinit(x^16 + 255*x^14 + 26775*x^12 + 1491750*x^10 + 47334375*x^8 + 852018750*x^6 + 8132906250*x^4 + 34855312500*x^2 + 43569140625, 1)
 

Normalized defining polynomial

\( x^{16} + 255 x^{14} + 26775 x^{12} + 1491750 x^{10} + 47334375 x^{8} + 852018750 x^{6} + 8132906250 x^{4} + 34855312500 x^{2} + 43569140625 \)

magma: DefiningPolynomial(K);
 
sage: K.defining_polynomial()
 
gp: K.pol
 

Invariants

Degree:  $16$
magma: Degree(K);
 
sage: K.degree()
 
gp: poldegree(K.pol)
 
Signature:  $[0, 8]$
magma: Signature(K);
 
sage: K.signature()
 
gp: K.sign
 
Discriminant:  \(480777155608471076297548800000000=2^{16}\cdot 3^{8}\cdot 5^{8}\cdot 17^{15}\)
magma: Discriminant(Integers(K));
 
sage: K.disc()
 
gp: K.disc
 
Root discriminant:  $110.31$
magma: Abs(Discriminant(Integers(K)))^(1/Degree(K));
 
sage: (K.disc().abs())^(1./K.degree())
 
gp: abs(K.disc)^(1/poldegree(K.pol))
 
Ramified primes:  $2, 3, 5, 17$
magma: PrimeDivisors(Discriminant(Integers(K)));
 
sage: K.disc().support()
 
gp: factor(abs(K.disc))[,1]~
 
This field is Galois and abelian over $\Q$.
Conductor:  \(1020=2^{2}\cdot 3\cdot 5\cdot 17\)
Dirichlet character group:    $\lbrace$$\chi_{1020}(1,·)$, $\chi_{1020}(299,·)$, $\chi_{1020}(961,·)$, $\chi_{1020}(841,·)$, $\chi_{1020}(779,·)$, $\chi_{1020}(781,·)$, $\chi_{1020}(719,·)$, $\chi_{1020}(661,·)$, $\chi_{1020}(539,·)$, $\chi_{1020}(479,·)$, $\chi_{1020}(419,·)$, $\chi_{1020}(421,·)$, $\chi_{1020}(361,·)$, $\chi_{1020}(839,·)$, $\chi_{1020}(121,·)$, $\chi_{1020}(959,·)$$\rbrace$
This is a CM field.

Integral basis (with respect to field generator \(a\))

$1$, $a$, $\frac{1}{15} a^{2}$, $\frac{1}{15} a^{3}$, $\frac{1}{225} a^{4}$, $\frac{1}{225} a^{5}$, $\frac{1}{3375} a^{6}$, $\frac{1}{3375} a^{7}$, $\frac{1}{50625} a^{8}$, $\frac{1}{50625} a^{9}$, $\frac{1}{759375} a^{10}$, $\frac{1}{759375} a^{11}$, $\frac{1}{11390625} a^{12}$, $\frac{1}{11390625} a^{13}$, $\frac{1}{170859375} a^{14}$, $\frac{1}{170859375} a^{15}$

magma: IntegralBasis(K);
 
sage: K.integral_basis()
 
gp: K.zk
 

Class group and class number

$C_{2}\times C_{2}\times C_{2}\times C_{139714}$, which has order $1117712$ (assuming GRH)

magma: ClassGroup(K);
 
sage: K.class_group().invariants()
 
gp: K.clgp
 

Unit group

magma: UK, f := UnitGroup(K);
 
sage: UK = K.unit_group()
 
Rank:  $7$
magma: UnitRank(K);
 
sage: UK.rank()
 
gp: K.fu
 
Torsion generator:  \( -1 \) (order $2$)
magma: K!f(TU.1) where TU,f is TorsionUnitGroup(K);
 
sage: UK.torsion_generator()
 
gp: K.tu[2]
 
Fundamental units:  Units are too long to display, but can be downloaded with other data for this field from 'Stored data to gp' link to the right (assuming GRH)
magma: [K!f(g): g in Generators(UK)];
 
sage: UK.fundamental_units()
 
gp: K.fu
 
Regulator:  \( 3640.012213375973 \) (assuming GRH)
magma: Regulator(K);
 
sage: K.regulator()
 
gp: K.reg
 

Galois group

$C_{16}$ (as 16T1):

magma: GaloisGroup(K);
 
sage: K.galois_group(type='pari')
 
gp: polgalois(K.pol)
 
A cyclic group of order 16
The 16 conjugacy class representatives for $C_{16}$
Character table for $C_{16}$

Intermediate fields

\(\Q(\sqrt{17}) \), 4.4.4913.1, \(\Q(\zeta_{17})^+\)

Fields in the database are given up to isomorphism. Isomorphic intermediate fields are shown with their multiplicities.

Frobenius cycle types

$p$ 2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59
Cycle type R R R $16$ $16$ ${\href{/LocalNumberField/13.4.0.1}{4} }^{4}$ R ${\href{/LocalNumberField/19.8.0.1}{8} }^{2}$ $16$ $16$ $16$ $16$ $16$ ${\href{/LocalNumberField/43.8.0.1}{8} }^{2}$ ${\href{/LocalNumberField/47.4.0.1}{4} }^{4}$ ${\href{/LocalNumberField/53.8.0.1}{8} }^{2}$ ${\href{/LocalNumberField/59.8.0.1}{8} }^{2}$

In the table, R denotes a ramified prime. Cycle lengths which are repeated in a cycle type are indicated by exponents.

magma: p := 7; // to obtain a list of $[e_i,f_i]$ for the factorization of the ideal $p\mathcal{O}_K$:
 
magma: idealfactors := Factorization(p*Integers(K)); // get the data
 
magma: [<primefactor[2], Valuation(Norm(primefactor[1]), p)> : primefactor in idealfactors];
 
sage: p = 7; # to obtain a list of $[e_i,f_i]$ for the factorization of the ideal $p\mathcal{O}_K$:
 
sage: [(e, pr.norm().valuation(p)) for pr,e in K.factor(p)]
 
gp: p = 7; \\ to obtain a list of $[e_i,f_i]$ for the factorization of the ideal $p\mathcal{O}_K$:
 
gp: idealfactors = idealprimedec(K, p); \\ get the data
 
gp: vector(length(idealfactors), j, [idealfactors[j][3], idealfactors[j][4]])
 

Local algebras for ramified primes

$p$LabelPolynomial $e$ $f$ $c$ Galois group Slope content
$2$2.8.8.4$x^{8} + 2 x^{7} + 2 x^{6} + 8 x^{3} + 48$$2$$4$$8$$C_8$$[2]^{4}$
2.8.8.4$x^{8} + 2 x^{7} + 2 x^{6} + 8 x^{3} + 48$$2$$4$$8$$C_8$$[2]^{4}$
3Data not computed
5Data not computed
17Data not computed