\\ Pari/GP code for working with number field 18.0.1955476758561888850288369070881021250289363000000000000.1.
\\ Some of these functions may take a long time to execute (this depends on the field).


\\ Define the number field: 
K = bnfinit(y^18 - 9*y^17 + 39*y^16 - 18*y^15 - 489*y^14 + 2259*y^13 - 46082*y^12 + 294723*y^11 - 868809*y^10 - 832476*y^9 + 9141591*y^8 - 21041973*y^7 + 634588399*y^6 - 1846066752*y^5 + 2444612454*y^4 - 2002296426*y^3 + 1157395500*y^2 - 374881932*y + 57871188, 1)

\\ Defining polynomial: 
K.pol

\\ Degree over Q: 
poldegree(K.pol)

\\ Signature: 
K.sign

\\ Discriminant: 
K.disc

\\ Ramified primes: 
factor(abs(K.disc))[,1]~

\\ Integral basis: 
K.zk

\\ Class group: 
K.clgp

\\ Unit rank: 
K.fu

\\ Generator for roots of unity: 
K.tu[2]

\\ Fundamental units: 
K.fu

\\ Regulator: 
K.reg

\\ Analytic class number formula: 
\\ self-contained Pari/GP code snippet to compute the analytic class number formula
K = bnfinit(x^18 - 9*x^17 + 39*x^16 - 18*x^15 - 489*x^14 + 2259*x^13 - 46082*x^12 + 294723*x^11 - 868809*x^10 - 832476*x^9 + 9141591*x^8 - 21041973*x^7 + 634588399*x^6 - 1846066752*x^5 + 2444612454*x^4 - 2002296426*x^3 + 1157395500*x^2 - 374881932*x + 57871188, 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)))]

\\ Intermediate fields: 
L = nfsubfields(K); L[2..length(b)]

\\ Galois group: 
polgalois(K.pol)

\\ Frobenius cycle types: 
\\ 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]])