Label Dim. $$A$$ Field CM Traces $q$-expansion
$$a_2$$ $$a_3$$ $$a_5$$ $$a_7$$
21.3.f.a $$2$$ $$0.572$$ $$\Q(\sqrt{-3})$$ None $$-3$$ $$-3$$ $$9$$ $$13$$ $$q-3\zeta_{6}q^{2}+(-1-\zeta_{6})q^{3}+(-5+5\zeta_{6})q^{4}+\cdots$$
21.3.f.b $$2$$ $$0.572$$ $$\Q(\sqrt{-3})$$ None $$-1$$ $$3$$ $$-9$$ $$-7$$ $$q-\zeta_{6}q^{2}+(1+\zeta_{6})q^{3}+(3-3\zeta_{6})q^{4}+\cdots$$
21.3.f.c $$2$$ $$0.572$$ $$\Q(\sqrt{-3})$$ None $$2$$ $$-3$$ $$-6$$ $$-7$$ $$q+2\zeta_{6}q^{2}+(-1-\zeta_{6})q^{3}+(-4+2\zeta_{6})q^{5}+\cdots$$