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Properties

Label 16.6.50641820249...8827.2
Degree $16$
Signature $[6, 5]$
Discriminant $-\,17^{14}\cdot 67^{3}$
Root discriminant $26.24$
Ramified primes $17, 67$
Class number $1$ (GRH)
Class group Trivial (GRH)
Galois group 16T1351

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Show commands for: Magma / SageMath / Pari/GP

magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(R![-1, -28, -78, -31, 93, 243, 299, 240, 100, -113, -97, -69, 19, -2, 3, -2, 1]);
 
sage: x = polygen(QQ); K.<a> = NumberField(x^16 - 2*x^15 + 3*x^14 - 2*x^13 + 19*x^12 - 69*x^11 - 97*x^10 - 113*x^9 + 100*x^8 + 240*x^7 + 299*x^6 + 243*x^5 + 93*x^4 - 31*x^3 - 78*x^2 - 28*x - 1)
 
gp: K = bnfinit(x^16 - 2*x^15 + 3*x^14 - 2*x^13 + 19*x^12 - 69*x^11 - 97*x^10 - 113*x^9 + 100*x^8 + 240*x^7 + 299*x^6 + 243*x^5 + 93*x^4 - 31*x^3 - 78*x^2 - 28*x - 1, 1)
 

Normalized defining polynomial

\( x^{16} - 2 x^{15} + 3 x^{14} - 2 x^{13} + 19 x^{12} - 69 x^{11} - 97 x^{10} - 113 x^{9} + 100 x^{8} + 240 x^{7} + 299 x^{6} + 243 x^{5} + 93 x^{4} - 31 x^{3} - 78 x^{2} - 28 x - 1 \)

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

Invariants

Degree:  $16$
magma: Degree(K);
 
sage: K.degree()
 
gp: poldegree(K.pol)
 
Signature:  $[6, 5]$
magma: Signature(K);
 
sage: K.signature()
 
gp: K.sign
 
Discriminant:  \(-50641820249485101608827=-\,17^{14}\cdot 67^{3}\)
magma: Discriminant(Integers(K));
 
sage: K.disc()
 
gp: K.disc
 
Root discriminant:  $26.24$
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:  $17, 67$
magma: PrimeDivisors(Discriminant(Integers(K)));
 
sage: K.disc().support()
 
gp: factor(abs(K.disc))[,1]~
 
This field is not Galois over $\Q$.
This is not a CM field.

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

$1$, $a$, $a^{2}$, $a^{3}$, $a^{4}$, $a^{5}$, $a^{6}$, $a^{7}$, $a^{8}$, $a^{9}$, $a^{10}$, $a^{11}$, $\frac{1}{17} a^{12} - \frac{4}{17} a^{11} + \frac{1}{17} a^{10} - \frac{7}{17} a^{9} - \frac{8}{17} a^{8} + \frac{4}{17} a^{7} + \frac{5}{17} a^{6} + \frac{4}{17} a^{5} - \frac{2}{17} a^{4} - \frac{7}{17} a^{3} - \frac{4}{17} a^{2} + \frac{3}{17} a + \frac{1}{17}$, $\frac{1}{17} a^{13} + \frac{2}{17} a^{11} - \frac{3}{17} a^{10} - \frac{2}{17} a^{9} + \frac{6}{17} a^{8} + \frac{4}{17} a^{7} + \frac{7}{17} a^{6} - \frac{3}{17} a^{5} + \frac{2}{17} a^{4} + \frac{2}{17} a^{3} + \frac{4}{17} a^{2} - \frac{4}{17} a + \frac{4}{17}$, $\frac{1}{34} a^{14} - \frac{1}{34} a^{13} - \frac{1}{34} a^{12} - \frac{5}{17} a^{11} - \frac{1}{17} a^{10} - \frac{5}{34} a^{9} - \frac{6}{17} a^{8} + \frac{4}{17} a^{7} - \frac{4}{17} a^{6} + \frac{5}{17} a^{5} - \frac{11}{34} a^{4} + \frac{3}{17} a^{3} + \frac{2}{17} a^{2} - \frac{1}{34} a - \frac{7}{34}$, $\frac{1}{138821779092922} a^{15} + \frac{284093387562}{69410889546461} a^{14} - \frac{1006391890001}{69410889546461} a^{13} - \frac{25512297373}{138821779092922} a^{12} + \frac{30527787357066}{69410889546461} a^{11} - \frac{6134638163737}{138821779092922} a^{10} - \frac{1997106849349}{8165987005466} a^{9} + \frac{30180237743122}{69410889546461} a^{8} - \frac{319865870295}{69410889546461} a^{7} - \frac{634718870665}{4082993502733} a^{6} + \frac{7624563280677}{138821779092922} a^{5} + \frac{36944345011201}{138821779092922} a^{4} + \frac{33003836343972}{69410889546461} a^{3} + \frac{52148147201853}{138821779092922} a^{2} + \frac{4703046558031}{69410889546461} a - \frac{31536396521913}{138821779092922}$

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

Class group and class number

Trivial group, which has order $1$ (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:  $10$
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:  \( 133617.46203 \) (assuming GRH)
magma: Regulator(K);
 
sage: K.regulator()
 
gp: K.reg
 

Galois group

16T1351:

magma: GaloisGroup(K);
 
sage: K.galois_group(type='pari')
 
gp: polgalois(K.pol)
 
A solvable group of order 2048
The 56 conjugacy class representatives for t16n1351 are not computed
Character table for t16n1351 is not computed

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.

Sibling fields

Degree 16 siblings: data not computed
Degree 32 siblings: data not computed

Frobenius cycle types

$p$ 2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59
Cycle type ${\href{/LocalNumberField/2.8.0.1}{8} }{,}\,{\href{/LocalNumberField/2.4.0.1}{4} }^{2}$ $16$ $16$ $16$ $16$ ${\href{/LocalNumberField/13.4.0.1}{4} }^{3}{,}\,{\href{/LocalNumberField/13.2.0.1}{2} }^{2}$ R ${\href{/LocalNumberField/19.4.0.1}{4} }^{4}$ ${\href{/LocalNumberField/23.8.0.1}{8} }^{2}$ ${\href{/LocalNumberField/29.8.0.1}{8} }^{2}$ $16$ ${\href{/LocalNumberField/37.8.0.1}{8} }^{2}$ $16$ ${\href{/LocalNumberField/43.8.0.1}{8} }{,}\,{\href{/LocalNumberField/43.4.0.1}{4} }^{2}$ ${\href{/LocalNumberField/47.4.0.1}{4} }^{2}{,}\,{\href{/LocalNumberField/47.2.0.1}{2} }^{4}$ ${\href{/LocalNumberField/53.8.0.1}{8} }{,}\,{\href{/LocalNumberField/53.4.0.1}{4} }^{2}$ ${\href{/LocalNumberField/59.8.0.1}{8} }^{2}$

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
$17$17.8.7.3$x^{8} - 17$$8$$1$$7$$C_8$$[\ ]_{8}$
17.8.7.3$x^{8} - 17$$8$$1$$7$$C_8$$[\ ]_{8}$
67Data not computed