Properties

Label 255.77
Modulus $255$
Conductor $255$
Order $8$
Real no
Primitive yes
Minimal yes
Parity even

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Show commands: PariGP / SageMath
from sage.modular.dirichlet import DirichletCharacter
 
H = DirichletGroup(255, base_ring=CyclotomicField(8))
 
M = H._module
 
chi = DirichletCharacter(H, M([4,2,1]))
 
pari: [g,chi] = znchar(Mod(77,255))
 

Basic properties

Modulus: \(255\)
Conductor: \(255\)
sage: chi.conductor()
 
pari: znconreyconductor(g,chi)
 
Order: \(8\)
sage: chi.multiplicative_order()
 
pari: charorder(g,chi)
 
Real: no
Primitive: yes
sage: chi.is_primitive()
 
pari: #znconreyconductor(g,chi)==1
 
Minimal: yes
Parity: even
sage: chi.is_odd()
 
pari: zncharisodd(g,chi)
 

Galois orbit 255.v

\(\chi_{255}(53,\cdot)\) \(\chi_{255}(77,\cdot)\) \(\chi_{255}(83,\cdot)\) \(\chi_{255}(212,\cdot)\)

sage: chi.galois_orbit()
 
order = charorder(g,chi)
 
[ charpow(g,chi, k % order) | k <-[1..order-1], gcd(k,order)==1 ]
 

Related number fields

Field of values: \(\Q(\zeta_{8})\)
Fixed field: 8.8.519334883015625.1

Values on generators

\((86,52,241)\) → \((-1,i,e\left(\frac{1}{8}\right))\)

First values

\(a\) \(-1\)\(1\)\(2\)\(4\)\(7\)\(8\)\(11\)\(13\)\(14\)\(16\)\(19\)\(22\)
\( \chi_{ 255 }(77, a) \) \(1\)\(1\)\(-1\)\(1\)\(e\left(\frac{5}{8}\right)\)\(-1\)\(e\left(\frac{3}{8}\right)\)\(i\)\(e\left(\frac{1}{8}\right)\)\(1\)\(i\)\(e\left(\frac{7}{8}\right)\)
sage: chi.jacobi_sum(n)
 
\( \chi_{ 255 }(77,a) \;\) at \(\;a = \) e.g. 2

Gauss sum

sage: chi.gauss_sum(a)
 
pari: znchargauss(g,chi,a)
 
\( \tau_{ a }( \chi_{ 255 }(77,·) )\;\) at \(\;a = \) e.g. 2

Jacobi sum

sage: chi.jacobi_sum(n)
 
\( J(\chi_{ 255 }(77,·),\chi_{ 255 }(n,·)) \;\) for \( \; n = \) e.g. 1

Kloosterman sum

sage: chi.kloosterman_sum(a,b)
 
\(K(a,b,\chi_{ 255 }(77,·)) \;\) at \(\; a,b = \) e.g. 1,2