Properties

Label 20.0.194...125.1
Degree $20$
Signature $(0, 10)$
Discriminant $1.946\times 10^{36}$
Root discriminant \(65.23\)
Ramified primes $5,41$
Class number $505$ (GRH)
Class group [505] (GRH)
Galois group $C_{20}$ (as 20T1)

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Normalized defining polynomial

Copy content comment:Define the number field
 
Copy content sage:x = polygen(QQ); K.<a> = NumberField(x^20 - x^19 + 17*x^18 - 38*x^17 + 294*x^16 + 679*x^15 + 3849*x^14 + 6496*x^13 + 45177*x^12 + 27901*x^11 + 73952*x^10 + 44804*x^9 + 108670*x^8 + 59106*x^7 + 153711*x^6 + 82674*x^5 + 202338*x^4 + 88695*x^3 + 39366*x^2 + 15309*x + 6561)
 
Copy content gp:K = bnfinit(y^20 - y^19 + 17*y^18 - 38*y^17 + 294*y^16 + 679*y^15 + 3849*y^14 + 6496*y^13 + 45177*y^12 + 27901*y^11 + 73952*y^10 + 44804*y^9 + 108670*y^8 + 59106*y^7 + 153711*y^6 + 82674*y^5 + 202338*y^4 + 88695*y^3 + 39366*y^2 + 15309*y + 6561, 1)
 
Copy content magma:R<x> := PolynomialRing(Rationals()); K<a> := NumberField(x^20 - x^19 + 17*x^18 - 38*x^17 + 294*x^16 + 679*x^15 + 3849*x^14 + 6496*x^13 + 45177*x^12 + 27901*x^11 + 73952*x^10 + 44804*x^9 + 108670*x^8 + 59106*x^7 + 153711*x^6 + 82674*x^5 + 202338*x^4 + 88695*x^3 + 39366*x^2 + 15309*x + 6561);
 
Copy content oscar:Qx, x = polynomial_ring(QQ); K, a = number_field(x^20 - x^19 + 17*x^18 - 38*x^17 + 294*x^16 + 679*x^15 + 3849*x^14 + 6496*x^13 + 45177*x^12 + 27901*x^11 + 73952*x^10 + 44804*x^9 + 108670*x^8 + 59106*x^7 + 153711*x^6 + 82674*x^5 + 202338*x^4 + 88695*x^3 + 39366*x^2 + 15309*x + 6561)
 

\( x^{20} - x^{19} + 17 x^{18} - 38 x^{17} + 294 x^{16} + 679 x^{15} + 3849 x^{14} + 6496 x^{13} + \cdots + 6561 \) Copy content Toggle raw display

Copy content comment:Defining polynomial
 
Copy content sage:K.defining_polynomial()
 
Copy content gp:K.pol
 
Copy content magma:DefiningPolynomial(K);
 
Copy content oscar:defining_polynomial(K)
 

Invariants

Degree:  $20$
Copy content comment:Degree over Q
 
Copy content sage:K.degree()
 
Copy content gp:poldegree(K.pol)
 
Copy content magma:Degree(K);
 
Copy content oscar:degree(K)
 
Signature:  $(0, 10)$
Copy content comment:Signature
 
Copy content sage:K.signature()
 
Copy content gp:K.sign
 
Copy content magma:Signature(K);
 
Copy content oscar:signature(K)
 
Discriminant:   \(1945771207112214793287128936767578125\) \(\medspace = 5^{15}\cdot 41^{16}\) Copy content Toggle raw display
Copy content comment:Discriminant
 
Copy content sage:K.disc()
 
Copy content gp:K.disc
 
Copy content magma:OK := Integers(K); Discriminant(OK);
 
Copy content oscar:OK = ring_of_integers(K); discriminant(OK)
 
Root discriminant:  \(65.23\)
Copy content comment:Root discriminant
 
Copy content sage:(K.disc().abs())^(1./K.degree())
 
Copy content gp:abs(K.disc)^(1/poldegree(K.pol))
 
Copy content magma:Abs(Discriminant(OK))^(1/Degree(K));
 
Copy content oscar:OK = ring_of_integers(K); (1.0 * abs(discriminant(OK)))^(1/degree(K))
 
Galois root discriminant:  $5^{3/4}41^{4/5}\approx 65.23108294968821$
Ramified primes:   \(5\), \(41\) Copy content Toggle raw display
Copy content comment:Ramified primes
 
Copy content sage:K.disc().support()
 
Copy content gp:factor(abs(K.disc))[,1]~
 
Copy content magma:PrimeDivisors(Discriminant(OK));
 
Copy content oscar:prime_divisors(discriminant(OK))
 
Discriminant root field:  \(\Q(\sqrt{5}) \)
$\Aut(K/\Q)$ $=$ $\Gal(K/\Q)$:   $C_{20}$
Copy content comment:Automorphisms
 
Copy content sage:K.automorphisms()
 
Copy content magma:Automorphisms(K);
 
Copy content oscar:automorphism_group(K)
 
This field is Galois and abelian over $\Q$.
Conductor:  \(205=5\cdot 41\)
Dirichlet character group:    $\lbrace$$\chi_{205}(1,·)$, $\chi_{205}(133,·)$, $\chi_{205}(201,·)$, $\chi_{205}(139,·)$, $\chi_{205}(141,·)$, $\chi_{205}(78,·)$, $\chi_{205}(16,·)$, $\chi_{205}(18,·)$, $\chi_{205}(83,·)$, $\chi_{205}(92,·)$, $\chi_{205}(98,·)$, $\chi_{205}(37,·)$, $\chi_{205}(42,·)$, $\chi_{205}(174,·)$, $\chi_{205}(51,·)$, $\chi_{205}(182,·)$, $\chi_{205}(119,·)$, $\chi_{205}(57,·)$, $\chi_{205}(59,·)$, $\chi_{205}(124,·)$$\rbrace$
This is a CM field.
Reflex fields:  unavailable$^{512}$

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

$1$, $a$, $a^{2}$, $a^{3}$, $a^{4}$, $a^{5}$, $a^{6}$, $a^{7}$, $a^{8}$, $\frac{1}{3}a^{9}+\frac{1}{3}a^{7}+\frac{1}{3}a^{5}+\frac{1}{3}a^{3}+\frac{1}{3}a$, $\frac{1}{3}a^{10}+\frac{1}{3}a^{8}+\frac{1}{3}a^{6}+\frac{1}{3}a^{4}+\frac{1}{3}a^{2}$, $\frac{1}{3}a^{11}-\frac{1}{3}a$, $\frac{1}{3}a^{12}-\frac{1}{3}a^{2}$, $\frac{1}{3}a^{13}-\frac{1}{3}a^{3}$, $\frac{1}{9}a^{14}-\frac{1}{9}a^{13}-\frac{1}{9}a^{12}+\frac{1}{9}a^{11}+\frac{1}{9}a^{9}+\frac{4}{9}a^{7}-\frac{2}{9}a^{5}+\frac{2}{9}a^{4}-\frac{1}{9}a^{3}-\frac{2}{9}a^{2}-\frac{1}{3}a$, $\frac{1}{27}a^{15}-\frac{1}{27}a^{14}-\frac{1}{27}a^{13}-\frac{2}{27}a^{12}-\frac{1}{9}a^{11}+\frac{4}{27}a^{10}-\frac{1}{9}a^{9}-\frac{11}{27}a^{8}-\frac{4}{9}a^{7}+\frac{10}{27}a^{6}+\frac{8}{27}a^{5}+\frac{11}{27}a^{4}-\frac{5}{27}a^{3}-\frac{2}{9}a^{2}+\frac{1}{3}a$, $\frac{1}{243}a^{16}+\frac{2}{243}a^{15}-\frac{13}{243}a^{14}+\frac{40}{243}a^{13}-\frac{4}{27}a^{12}-\frac{5}{243}a^{11}-\frac{1}{9}a^{10}+\frac{34}{243}a^{9}-\frac{2}{9}a^{8}+\frac{28}{243}a^{7}+\frac{110}{243}a^{6}-\frac{100}{243}a^{5}-\frac{53}{243}a^{4}-\frac{4}{81}a^{3}+\frac{4}{27}a^{2}-\frac{4}{9}a+\frac{1}{3}$, $\frac{1}{19\cdots 39}a^{17}+\frac{29\cdots 91}{19\cdots 39}a^{16}+\frac{70\cdots 01}{19\cdots 39}a^{15}+\frac{39\cdots 50}{19\cdots 39}a^{14}+\frac{19\cdots 30}{64\cdots 13}a^{13}+\frac{99\cdots 70}{19\cdots 39}a^{12}+\frac{89\cdots 62}{64\cdots 13}a^{11}+\frac{17\cdots 57}{19\cdots 39}a^{10}+\frac{49\cdots 59}{64\cdots 13}a^{9}-\frac{18\cdots 55}{19\cdots 39}a^{8}-\frac{24\cdots 05}{19\cdots 39}a^{7}+\frac{44\cdots 46}{19\cdots 39}a^{6}+\frac{44\cdots 33}{19\cdots 39}a^{5}-\frac{11\cdots 99}{64\cdots 13}a^{4}+\frac{96\cdots 61}{21\cdots 71}a^{3}+\frac{13\cdots 96}{71\cdots 57}a^{2}-\frac{93\cdots 71}{23\cdots 19}a+\frac{950506816119959}{79\cdots 73}$, $\frac{1}{58\cdots 17}a^{18}-\frac{1}{58\cdots 17}a^{17}-\frac{76\cdots 47}{58\cdots 17}a^{16}-\frac{34\cdots 70}{58\cdots 17}a^{15}-\frac{39\cdots 66}{19\cdots 39}a^{14}+\frac{36\cdots 23}{58\cdots 17}a^{13}-\frac{50\cdots 08}{19\cdots 39}a^{12}+\frac{82\cdots 82}{58\cdots 17}a^{11}+\frac{15\cdots 49}{19\cdots 39}a^{10}+\frac{84\cdots 42}{58\cdots 17}a^{9}+\frac{21\cdots 85}{58\cdots 17}a^{8}+\frac{21\cdots 48}{58\cdots 17}a^{7}-\frac{26\cdots 17}{58\cdots 17}a^{6}+\frac{33\cdots 09}{19\cdots 39}a^{5}+\frac{32\cdots 14}{64\cdots 13}a^{4}-\frac{13\cdots 75}{21\cdots 71}a^{3}-\frac{31\cdots 64}{71\cdots 57}a^{2}-\frac{41\cdots 17}{23\cdots 19}a-\frac{203965088156943}{26\cdots 91}$, $\frac{1}{17\cdots 51}a^{19}-\frac{1}{17\cdots 51}a^{18}-\frac{1}{17\cdots 51}a^{17}-\frac{30\cdots 79}{17\cdots 51}a^{16}+\frac{97\cdots 07}{58\cdots 17}a^{15}-\frac{51\cdots 70}{17\cdots 51}a^{14}-\frac{15\cdots 68}{58\cdots 17}a^{13}-\frac{17\cdots 77}{17\cdots 51}a^{12}+\frac{13\cdots 72}{58\cdots 17}a^{11}-\frac{16\cdots 55}{17\cdots 51}a^{10}+\frac{13\cdots 51}{17\cdots 51}a^{9}+\frac{18\cdots 70}{17\cdots 51}a^{8}+\frac{62\cdots 03}{17\cdots 51}a^{7}-\frac{18\cdots 71}{58\cdots 17}a^{6}+\frac{78\cdots 21}{19\cdots 39}a^{5}+\frac{11\cdots 69}{64\cdots 13}a^{4}-\frac{32\cdots 32}{21\cdots 71}a^{3}-\frac{575421866121556}{23\cdots 19}a^{2}+\frac{11\cdots 94}{23\cdots 19}a+\frac{11\cdots 85}{26\cdots 91}$ Copy content Toggle raw display

Copy content comment:Integral basis
 
Copy content sage:K.integral_basis()
 
Copy content gp:K.zk
 
Copy content magma:IntegralBasis(K);
 
Copy content oscar:basis(OK)
 

Monogenic:  Not computed
Index:  $1$
Inessential primes:  None

Class group and class number

Ideal class group:  $C_{505}$, which has order $505$ (assuming GRH)
Copy content comment:Class group
 
Copy content sage:K.class_group().invariants()
 
Copy content gp:K.clgp
 
Copy content magma:ClassGroup(K);
 
Copy content oscar:class_group(K)
 
Narrow class group:  $C_{505}$, which has order $505$ (assuming GRH)
Copy content comment:Narrow class group
 
Copy content sage:K.narrow_class_group().invariants()
 
Copy content gp:bnfnarrow(K)
 
Copy content magma:NarrowClassGroup(K);
 
Relative class number:   $505$ (assuming GRH)

Unit group

Copy content comment:Unit group
 
Copy content sage:UK = K.unit_group()
 
Copy content magma:UK, fUK := UnitGroup(K);
 
Copy content oscar:UK, fUK = unit_group(OK)
 
Rank:  $9$
Copy content comment:Unit rank
 
Copy content sage:UK.rank()
 
Copy content gp:K.fu
 
Copy content magma:UnitRank(K);
 
Copy content oscar:rank(UK)
 
Torsion generator:   \( -\frac{37742873463880}{5820102231020314317} a^{19} - \frac{120777195084416}{5820102231020314317} a^{18} - \frac{415335701549948}{5820102231020314317} a^{17} - \frac{1328549145928576}{5820102231020314317} a^{16} - \frac{1305903421850248}{1940034077006771439} a^{15} - \frac{74813923780102936}{5820102231020314317} a^{14} - \frac{77644639289893936}{1940034077006771439} a^{13} - \frac{809453903593472374}{5820102231020314317} a^{12} - \frac{824455327944994720}{1940034077006771439} a^{11} - \frac{7773205178483628208}{5820102231020314317} a^{10} - \frac{4144831780906988288}{5820102231020314317} a^{9} - \frac{11518392769430976728}{5820102231020314317} a^{8} - \frac{6084705844284598201}{5820102231020314317} a^{7} - \frac{67544646350959648}{23951037987737919} a^{6} - \frac{288453684735049288}{215559341889641271} a^{5} - \frac{289767136731592312}{71853113963213757} a^{4} - \frac{42385246899937240}{23951037987737919} a^{3} - \frac{139191462630118925}{23951037987737919} a^{2} - \frac{822794641512584}{2661226443081991} a - \frac{362331585253248}{2661226443081991} \)  (order $10$) Copy content Toggle raw display
Copy content comment:Generator for roots of unity
 
Copy content sage:UK.torsion_generator()
 
Copy content gp:K.tu[2]
 
Copy content magma:K!f(TU.1) where TU,f is TorsionUnitGroup(K);
 
Copy content oscar:torsion_units_generator(OK)
 
Fundamental units:   $\frac{450553955257480}{58\cdots 17}a^{19}-\frac{471136255221553}{58\cdots 17}a^{18}+\frac{76\cdots 48}{58\cdots 17}a^{17}-\frac{17\cdots 24}{58\cdots 17}a^{16}+\frac{44\cdots 48}{19\cdots 39}a^{15}+\frac{30\cdots 36}{58\cdots 17}a^{14}+\frac{56\cdots 43}{19\cdots 39}a^{13}+\frac{28\cdots 74}{58\cdots 17}a^{12}+\frac{66\cdots 20}{19\cdots 39}a^{11}+\frac{11\cdots 08}{58\cdots 17}a^{10}+\frac{29\cdots 88}{58\cdots 17}a^{9}+\frac{18\cdots 88}{58\cdots 17}a^{8}+\frac{43\cdots 01}{58\cdots 17}a^{7}+\frac{79\cdots 32}{21\cdots 71}a^{6}+\frac{22\cdots 88}{21\cdots 71}a^{5}+\frac{37\cdots 12}{71\cdots 57}a^{4}+\frac{97\cdots 13}{71\cdots 57}a^{3}+\frac{14\cdots 25}{23\cdots 19}a^{2}+\frac{10\cdots 84}{26\cdots 91}a+\frac{67466526829248}{26\cdots 91}$, $\frac{12831380305367}{64\cdots 13}a^{19}-\frac{57644344335847}{58\cdots 17}a^{18}+\frac{17\cdots 00}{58\cdots 17}a^{17}-\frac{32\cdots 11}{58\cdots 17}a^{16}+\frac{28\cdots 28}{58\cdots 17}a^{15}+\frac{34\cdots 80}{19\cdots 39}a^{14}+\frac{43\cdots 65}{58\cdots 17}a^{13}+\frac{29\cdots 64}{19\cdots 39}a^{12}+\frac{49\cdots 54}{58\cdots 17}a^{11}+\frac{16\cdots 24}{19\cdots 39}a^{10}+\frac{29\cdots 50}{58\cdots 17}a^{9}+\frac{66\cdots 85}{58\cdots 17}a^{8}+\frac{23\cdots 12}{58\cdots 17}a^{7}+\frac{12\cdots 75}{58\cdots 17}a^{6}+\frac{11\cdots 00}{23\cdots 19}a^{5}+\frac{16\cdots 68}{71\cdots 57}a^{4}+\frac{23\cdots 02}{23\cdots 19}a^{3}+\frac{77\cdots 96}{23\cdots 19}a^{2}-\frac{11\cdots 63}{23\cdots 19}a+\frac{16\cdots 92}{26\cdots 91}$, $\frac{106408797536995}{17\cdots 51}a^{19}-\frac{248883467214508}{17\cdots 51}a^{18}+\frac{17\cdots 40}{17\cdots 51}a^{17}-\frac{65\cdots 74}{17\cdots 51}a^{16}+\frac{11\cdots 72}{58\cdots 17}a^{15}+\frac{33\cdots 74}{17\cdots 51}a^{14}+\frac{87\cdots 15}{58\cdots 17}a^{13}-\frac{89\cdots 09}{17\cdots 51}a^{12}+\frac{94\cdots 82}{58\cdots 17}a^{11}-\frac{60\cdots 18}{17\cdots 51}a^{10}-\frac{77\cdots 54}{17\cdots 51}a^{9}-\frac{25\cdots 62}{17\cdots 51}a^{8}-\frac{19\cdots 80}{17\cdots 51}a^{7}-\frac{13\cdots 68}{58\cdots 17}a^{6}-\frac{31\cdots 53}{19\cdots 39}a^{5}-\frac{65\cdots 25}{21\cdots 71}a^{4}-\frac{95\cdots 32}{71\cdots 57}a^{3}-\frac{12\cdots 17}{71\cdots 57}a^{2}+\frac{49\cdots 27}{23\cdots 19}a-\frac{24\cdots 35}{79\cdots 73}$, $\frac{692144770469396}{58\cdots 17}a^{19}-\frac{13\cdots 19}{58\cdots 17}a^{18}+\frac{42\cdots 77}{19\cdots 39}a^{17}-\frac{38\cdots 30}{58\cdots 17}a^{16}+\frac{23\cdots 58}{58\cdots 17}a^{15}+\frac{25\cdots 29}{58\cdots 17}a^{14}+\frac{22\cdots 14}{58\cdots 17}a^{13}+\frac{19\cdots 81}{58\cdots 17}a^{12}+\frac{27\cdots 01}{58\cdots 17}a^{11}-\frac{10\cdots 80}{58\cdots 17}a^{10}+\frac{41\cdots 56}{58\cdots 17}a^{9}-\frac{15\cdots 69}{64\cdots 13}a^{8}+\frac{67\cdots 56}{58\cdots 17}a^{7}-\frac{23\cdots 81}{58\cdots 17}a^{6}+\frac{29\cdots 08}{19\cdots 39}a^{5}-\frac{43\cdots 75}{64\cdots 13}a^{4}+\frac{47\cdots 22}{21\cdots 71}a^{3}-\frac{59\cdots 41}{71\cdots 57}a^{2}+\frac{35\cdots 70}{79\cdots 73}a-\frac{42\cdots 89}{79\cdots 73}$, $\frac{559574343415210}{17\cdots 51}a^{19}-\frac{528348719793586}{17\cdots 51}a^{18}+\frac{87\cdots 21}{17\cdots 51}a^{17}-\frac{19\cdots 57}{17\cdots 51}a^{16}+\frac{50\cdots 70}{58\cdots 17}a^{15}+\frac{42\cdots 16}{17\cdots 51}a^{14}+\frac{65\cdots 62}{58\cdots 17}a^{13}+\frac{34\cdots 87}{17\cdots 51}a^{12}+\frac{77\cdots 23}{58\cdots 17}a^{11}+\frac{14\cdots 83}{17\cdots 51}a^{10}+\frac{15\cdots 52}{17\cdots 51}a^{9}+\frac{36\cdots 34}{17\cdots 51}a^{8}+\frac{38\cdots 58}{17\cdots 51}a^{7}+\frac{52\cdots 83}{58\cdots 17}a^{6}+\frac{59\cdots 34}{19\cdots 39}a^{5}+\frac{90\cdots 04}{21\cdots 71}a^{4}+\frac{13\cdots 08}{71\cdots 57}a^{3}+\frac{20\cdots 12}{71\cdots 57}a^{2}+\frac{15\cdots 87}{23\cdots 19}a+\frac{41\cdots 64}{79\cdots 73}$, $\frac{144412477597537}{58\cdots 17}a^{19}-\frac{283467712368068}{58\cdots 17}a^{18}+\frac{804892791458780}{19\cdots 39}a^{17}-\frac{75\cdots 15}{58\cdots 17}a^{16}+\frac{44\cdots 92}{58\cdots 17}a^{15}+\frac{65\cdots 35}{58\cdots 17}a^{14}+\frac{40\cdots 30}{58\cdots 17}a^{13}+\frac{30\cdots 78}{58\cdots 17}a^{12}+\frac{50\cdots 58}{58\cdots 17}a^{11}-\frac{29\cdots 32}{58\cdots 17}a^{10}-\frac{46\cdots 40}{58\cdots 17}a^{9}-\frac{43\cdots 05}{64\cdots 13}a^{8}+\frac{11\cdots 43}{58\cdots 17}a^{7}-\frac{49\cdots 21}{58\cdots 17}a^{6}+\frac{71\cdots 40}{21\cdots 71}a^{5}-\frac{11\cdots 97}{79\cdots 73}a^{4}-\frac{50\cdots 99}{79\cdots 73}a^{3}-\frac{73\cdots 21}{23\cdots 19}a^{2}-\frac{15\cdots 02}{23\cdots 19}a-\frac{16\cdots 47}{26\cdots 91}$, $\frac{791063729432692}{17\cdots 51}a^{19}-\frac{732857504871319}{17\cdots 51}a^{18}+\frac{13\cdots 47}{17\cdots 51}a^{17}-\frac{29\cdots 97}{17\cdots 51}a^{16}+\frac{78\cdots 90}{58\cdots 17}a^{15}+\frac{53\cdots 42}{17\cdots 51}a^{14}+\frac{10\cdots 45}{58\cdots 17}a^{13}+\frac{56\cdots 85}{17\cdots 51}a^{12}+\frac{12\cdots 72}{58\cdots 17}a^{11}+\frac{26\cdots 59}{17\cdots 51}a^{10}+\frac{75\cdots 27}{17\cdots 51}a^{9}+\frac{42\cdots 68}{17\cdots 51}a^{8}+\frac{85\cdots 88}{17\cdots 51}a^{7}+\frac{12\cdots 44}{58\cdots 17}a^{6}+\frac{53\cdots 55}{64\cdots 13}a^{5}+\frac{34\cdots 21}{64\cdots 13}a^{4}+\frac{23\cdots 10}{21\cdots 71}a^{3}+\frac{19\cdots 52}{71\cdots 57}a^{2}+\frac{95\cdots 61}{79\cdots 73}a+\frac{66\cdots 69}{79\cdots 73}$, $\frac{285890809901222}{17\cdots 51}a^{19}-\frac{446071768784213}{17\cdots 51}a^{18}+\frac{48\cdots 09}{17\cdots 51}a^{17}-\frac{12\cdots 63}{17\cdots 51}a^{16}+\frac{94\cdots 22}{19\cdots 39}a^{15}+\frac{16\cdots 80}{17\cdots 51}a^{14}+\frac{98\cdots 60}{19\cdots 39}a^{13}+\frac{13\cdots 56}{17\cdots 51}a^{12}+\frac{12\cdots 01}{19\cdots 39}a^{11}+\frac{17\cdots 73}{17\cdots 51}a^{10}+\frac{91\cdots 20}{17\cdots 51}a^{9}+\frac{23\cdots 15}{17\cdots 51}a^{8}-\frac{15\cdots 48}{17\cdots 51}a^{7}+\frac{18\cdots 58}{58\cdots 17}a^{6}-\frac{25\cdots 93}{19\cdots 39}a^{5}+\frac{57\cdots 77}{21\cdots 71}a^{4}+\frac{84\cdots 68}{71\cdots 57}a^{3}-\frac{11\cdots 93}{71\cdots 57}a^{2}+\frac{43\cdots 73}{23\cdots 19}a+\frac{137049766155941}{79\cdots 73}$, $\frac{690983413058053}{17\cdots 51}a^{19}-\frac{13\cdots 96}{17\cdots 51}a^{18}+\frac{12\cdots 89}{17\cdots 51}a^{17}-\frac{37\cdots 07}{17\cdots 51}a^{16}+\frac{77\cdots 94}{58\cdots 17}a^{15}+\frac{27\cdots 38}{17\cdots 51}a^{14}+\frac{76\cdots 40}{58\cdots 17}a^{13}+\frac{22\cdots 83}{17\cdots 51}a^{12}+\frac{93\cdots 00}{58\cdots 17}a^{11}-\frac{79\cdots 51}{17\cdots 51}a^{10}+\frac{44\cdots 74}{17\cdots 51}a^{9}-\frac{10\cdots 56}{17\cdots 51}a^{8}+\frac{56\cdots 72}{17\cdots 51}a^{7}-\frac{14\cdots 28}{58\cdots 17}a^{6}+\frac{22\cdots 89}{64\cdots 13}a^{5}+\frac{60\cdots 85}{64\cdots 13}a^{4}+\frac{90\cdots 53}{21\cdots 71}a^{3}-\frac{77\cdots 32}{71\cdots 57}a^{2}-\frac{35\cdots 17}{79\cdots 73}a+\frac{24\cdots 60}{79\cdots 73}$ Copy content Toggle raw display (assuming GRH)
Copy content comment:Fundamental units
 
Copy content sage:UK.fundamental_units()
 
Copy content gp:K.fu
 
Copy content magma:[K|fUK(g): g in Generators(UK)];
 
Copy content oscar:[K(fUK(a)) for a in gens(UK)]
 
Regulator:  \( 41023218.2567 \) (assuming GRH)
Copy content comment:Regulator
 
Copy content sage:K.regulator()
 
Copy content gp:K.reg
 
Copy content magma:Regulator(K);
 
Copy content oscar:regulator(K)
 

Class number formula

\[ \begin{aligned}\lim_{s\to 1} (s-1)\zeta_K(s) =\mathstrut & \frac{2^{r_1}\cdot (2\pi)^{r_2}\cdot R\cdot h}{w\cdot\sqrt{|D|}}\cr \approx\mathstrut &\frac{2^{0}\cdot(2\pi)^{10}\cdot 41023218.2567 \cdot 505}{10\cdot\sqrt{1945771207112214793287128936767578125}}\cr\approx \mathstrut & 0.142420958097 \end{aligned}\] (assuming GRH)

Copy content comment:Analytic class number formula
 
Copy content sage:# self-contained SageMath code snippet to compute the analytic class number formula x = polygen(QQ); K.<a> = NumberField(x^20 - x^19 + 17*x^18 - 38*x^17 + 294*x^16 + 679*x^15 + 3849*x^14 + 6496*x^13 + 45177*x^12 + 27901*x^11 + 73952*x^10 + 44804*x^9 + 108670*x^8 + 59106*x^7 + 153711*x^6 + 82674*x^5 + 202338*x^4 + 88695*x^3 + 39366*x^2 + 15309*x + 6561) DK = K.disc(); r1,r2 = K.signature(); RK = K.regulator(); RR = RK.parent() hK = K.class_number(); wK = K.unit_group().torsion_generator().order(); 2^r1 * (2*RR(pi))^r2 * RK * hK / (wK * RR(sqrt(abs(DK))))
 
Copy content gp:\\ self-contained Pari/GP code snippet to compute the analytic class number formula K = bnfinit(x^20 - x^19 + 17*x^18 - 38*x^17 + 294*x^16 + 679*x^15 + 3849*x^14 + 6496*x^13 + 45177*x^12 + 27901*x^11 + 73952*x^10 + 44804*x^9 + 108670*x^8 + 59106*x^7 + 153711*x^6 + 82674*x^5 + 202338*x^4 + 88695*x^3 + 39366*x^2 + 15309*x + 6561, 1); [polcoeff (lfunrootres (lfuncreate (K))[1][1][2], -1), 2^K.r1 * (2*Pi)^K.r2 * K.reg * K.no / (K.tu[1] * sqrt (abs (K.disc)))]
 
Copy content magma:/* self-contained Magma code snippet to compute the analytic class number formula */ Qx<x> := PolynomialRing(Rationals()); K<a> := NumberField(x^20 - x^19 + 17*x^18 - 38*x^17 + 294*x^16 + 679*x^15 + 3849*x^14 + 6496*x^13 + 45177*x^12 + 27901*x^11 + 73952*x^10 + 44804*x^9 + 108670*x^8 + 59106*x^7 + 153711*x^6 + 82674*x^5 + 202338*x^4 + 88695*x^3 + 39366*x^2 + 15309*x + 6561); OK := Integers(K); DK := Discriminant(OK); UK, fUK := UnitGroup(OK); clK, fclK := ClassGroup(OK); r1,r2 := Signature(K); RK := Regulator(K); RR := Parent(RK); hK := #clK; wK := #TorsionSubgroup(UK); 2^r1 * (2*Pi(RR))^r2 * RK * hK / (wK * Sqrt(RR!Abs(DK)));
 
Copy content oscar:# self-contained Oscar code snippet to compute the analytic class number formula Qx, x = polynomial_ring(QQ); K, a = number_field(x^20 - x^19 + 17*x^18 - 38*x^17 + 294*x^16 + 679*x^15 + 3849*x^14 + 6496*x^13 + 45177*x^12 + 27901*x^11 + 73952*x^10 + 44804*x^9 + 108670*x^8 + 59106*x^7 + 153711*x^6 + 82674*x^5 + 202338*x^4 + 88695*x^3 + 39366*x^2 + 15309*x + 6561); OK = ring_of_integers(K); DK = discriminant(OK); UK, fUK = unit_group(OK); clK, fclK = class_group(OK); r1,r2 = signature(K); RK = regulator(K); RR = parent(RK); hK = order(clK); wK = torsion_units_order(K); 2^r1 * (2*pi)^r2 * RK * hK / (wK * sqrt(RR(abs(DK))))
 

Galois group

$C_{20}$ (as 20T1):

Copy content comment:Galois group
 
Copy content sage:K.galois_group()
 
Copy content gp:polgalois(K.pol)
 
Copy content magma:G = GaloisGroup(K);
 
Copy content oscar:G, Gtx = galois_group(K); degree(K) > 1 ? (G, transitive_group_identification(G)) : (G, nothing)
 
A cyclic group of order 20
The 20 conjugacy class representatives for $C_{20}$
Character table for $C_{20}$

Intermediate fields

\(\Q(\sqrt{5}) \), \(\Q(\zeta_{5})\), 5.5.2825761.1, 10.10.24952891341003125.1

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

Copy content comment:Intermediate fields
 
Copy content sage:K.subfields()[1:-1]
 
Copy content gp:L = nfsubfields(K); L[2..length(L)]
 
Copy content magma:L := Subfields(K); L[2..#L];
 
Copy content oscar:subfields(K)[2:end-1]
 

Frobenius cycle types

$p$ $2$ $3$ $5$ $7$ $11$ $13$ $17$ $19$ $23$ $29$ $31$ $37$ $41$ $43$ $47$ $53$ $59$
Cycle type $20$ ${\href{/padicField/3.4.0.1}{4} }^{5}$ R $20$ ${\href{/padicField/11.5.0.1}{5} }^{4}$ $20$ $20$ ${\href{/padicField/19.10.0.1}{10} }^{2}$ $20$ ${\href{/padicField/29.10.0.1}{10} }^{2}$ ${\href{/padicField/31.5.0.1}{5} }^{4}$ $20$ R $20$ $20$ $20$ ${\href{/padicField/59.10.0.1}{10} }^{2}$

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

Copy content comment:Frobenius cycle types
 
Copy content sage:# to obtain a list of [e_i,f_i] for the factorization of the ideal pO_K for p=7 in Sage: p = 7; [(e, pr.norm().valuation(p)) for pr,e in K.factor(p)]
 
Copy content gp:\\ to obtain a list of [e_i,f_i] for the factorization of the ideal pO_K for p=7 in Pari: p = 7; pfac = idealprimedec(K, p); vector(length(pfac), j, [pfac[j][3], pfac[j][4]])
 
Copy content magma:// to obtain a list of [e_i,f_i] for the factorization of the ideal pO_K for p=7 in Magma: p := 7; [<pr[2], Valuation(Norm(pr[1]), p)> : pr in Factorization(p*Integers(K))];
 
Copy content oscar:# to obtain a list of [e_i,f_i] for the factorization of the ideal pO_K for p=7 in Oscar: p = 7; pfac = factor(ideal(ring_of_integers(K), p)); [(e, valuation(norm(pr),p)) for (pr,e) in pfac]
 

Local algebras for ramified primes

$p$LabelPolynomial $e$ $f$ $c$ Galois group Slope content
\(5\) Copy content Toggle raw display 5.5.4.15a1.4$x^{20} + 16 x^{16} + 12 x^{15} + 96 x^{12} + 144 x^{11} + 54 x^{10} + 256 x^{8} + 576 x^{7} + 432 x^{6} + 108 x^{5} + 256 x^{4} + 768 x^{3} + 864 x^{2} + 432 x + 86$$4$$5$$15$20T1not computed
\(41\) Copy content Toggle raw display 41.1.5.4a1.1$x^{5} + 41$$5$$1$$4$$C_5$$$[\ ]_{5}$$
41.1.5.4a1.1$x^{5} + 41$$5$$1$$4$$C_5$$$[\ ]_{5}$$
41.1.5.4a1.1$x^{5} + 41$$5$$1$$4$$C_5$$$[\ ]_{5}$$
41.1.5.4a1.1$x^{5} + 41$$5$$1$$4$$C_5$$$[\ ]_{5}$$

Spectrum of ring of integers

(0)(0)(2)(3)(5)(7)(11)(13)(17)(19)(23)(29)(31)(37)(41)(43)(47)(53)(59)