2100.1-d6 $$\Q(\sqrt{21})$$ 2100.1 2100.1-d $$\bigl[1$$ , $$0$$ , $$0$$ , $$-361$$ , $$2585\bigr]$$
2100.1-bk6 $$\Q(\sqrt{21})$$ 2100.1 2100.1-bk $$\bigl[a$$ , $$1$$ , $$a$$ , $$1805 a - 5055$$ , $$63845 a - 178250\bigr]$$