# Properties

 Label 280.27 Modulus $280$ Conductor $280$ Order $4$ Real no Primitive yes Minimal yes Parity odd

# Related objects

Show commands for: Pari/GP / SageMath
sage: from sage.modular.dirichlet import DirichletCharacter

sage: H = DirichletGroup(280, base_ring=CyclotomicField(4))

sage: M = H._module

sage: chi = DirichletCharacter(H, M([2,2,1,2]))

pari: [g,chi] = znchar(Mod(27,280))

## Basic properties

 Modulus: $$280$$ Conductor: $$280$$ sage: chi.conductor()  pari: znconreyconductor(g,chi) Order: $$4$$ sage: chi.multiplicative_order()  pari: charorder(g,chi) Real: no Primitive: yes sage: chi.is_primitive()  pari: #znconreyconductor(g,chi)==1 Minimal: yes Parity: odd sage: chi.is_odd()  pari: zncharisodd(g,chi)

## Galois orbit 280.y

sage: chi.galois_orbit()

pari: order = charorder(g,chi)

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

## Related number fields

 Field of values: $$\Q(\sqrt{-1})$$ Fixed field: 4.0.392000.2

## Values on generators

$$(71,141,57,241)$$ → $$(-1,-1,i,-1)$$

## Values

 $$-1$$ $$1$$ $$3$$ $$9$$ $$11$$ $$13$$ $$17$$ $$19$$ $$23$$ $$27$$ $$29$$ $$31$$ $$-1$$ $$1$$ $$i$$ $$-1$$ $$1$$ $$-i$$ $$-i$$ $$1$$ $$i$$ $$-i$$ $$1$$ $$1$$
 value at e.g. 2

## Gauss sum

sage: chi.gauss_sum(a)

pari: znchargauss(g,chi,a)

$$\tau_{ a }( \chi_{ 280 }(27,·) )\;$$ at $$\;a =$$ e.g. 2
$$\displaystyle \tau_{2}(\chi_{280}(27,\cdot)) = \sum_{r\in \Z/280\Z} \chi_{280}(27,r) e\left(\frac{r}{140}\right) = 0.0$$

## Jacobi sum

sage: chi.jacobi_sum(n)

$$J(\chi_{ 280 }(27,·),\chi_{ 280 }(n,·)) \;$$ for $$\; n =$$ e.g. 1
$$\displaystyle J(\chi_{280}(27,\cdot),\chi_{280}(1,\cdot)) = \sum_{r\in \Z/280\Z} \chi_{280}(27,r) \chi_{280}(1,1-r) = 0$$

## Kloosterman sum

sage: chi.kloosterman_sum(a,b)

$$K(a,b,\chi_{ 280 }(27,·)) \;$$ at $$\; a,b =$$ e.g. 1,2
$$\displaystyle K(1,2,\chi_{280}(27,·)) = \sum_{r \in \Z/280\Z} \chi_{280}(27,r) e\left(\frac{1 r + 2 r^{-1}}{280}\right) = -15.8519420037+15.8519420037i$$