# Properties

 Modulus 20 Structure $$C_{4}\times C_{2}$$ Order 8

Show commands for: SageMath / Pari/GP

sage: from dirichlet_conrey import DirichletGroup_conrey # requires nonstandard Sage package to be installed

sage: H = DirichletGroup_conrey(20)

pari: g = idealstar(,20,2)

## Character group

 sage: G.order()  pari: g.no Order = 8 sage: H.invariants()  pari: g.cyc Structure = $$C_{4}\times C_{2}$$ sage: H.gens()  pari: g.gen Generators = $\chi_{20}(17,\cdot)$, $\chi_{20}(11,\cdot)$

## Characters

Each row describes a character. When available, the columns show the orbit label, order of the character, whether the character is primitive, and several values of the character.

orbit label order primitive -1 1 3 7 9 11 13 17
$$\chi_{20}(1,\cdot)$$ 20.a 1 No $$1$$ $$1$$ $$1$$ $$1$$ $$1$$ $$1$$ $$1$$ $$1$$
$$\chi_{20}(3,\cdot)$$ 20.e 4 Yes $$1$$ $$1$$ $$-i$$ $$i$$ $$-1$$ $$-1$$ $$i$$ $$-i$$
$$\chi_{20}(7,\cdot)$$ 20.e 4 Yes $$1$$ $$1$$ $$i$$ $$-i$$ $$-1$$ $$-1$$ $$-i$$ $$i$$
$$\chi_{20}(9,\cdot)$$ 20.c 2 No $$1$$ $$1$$ $$-1$$ $$-1$$ $$1$$ $$1$$ $$-1$$ $$-1$$
$$\chi_{20}(11,\cdot)$$ 20.b 2 No $$-1$$ $$1$$ $$-1$$ $$-1$$ $$1$$ $$-1$$ $$1$$ $$1$$
$$\chi_{20}(13,\cdot)$$ 20.f 4 No $$-1$$ $$1$$ $$i$$ $$-i$$ $$-1$$ $$1$$ $$i$$ $$-i$$
$$\chi_{20}(17,\cdot)$$ 20.f 4 No $$-1$$ $$1$$ $$-i$$ $$i$$ $$-1$$ $$1$$ $$-i$$ $$i$$
$$\chi_{20}(19,\cdot)$$ 20.d 2 Yes $$-1$$ $$1$$ $$1$$ $$1$$ $$1$$ $$-1$$ $$-1$$ $$-1$$