D = [ -20, -47, -68 ]

K = Q(sqrt(-20)):	-q - q^2 - q^5 - q^6 + q^7 - q^8 - q^9 + q^11 + q^12 + q^14 - q^16 + q^18 - q^19 - q^20 - q^21 - q^22 - q^23 + q^24 - q^25 - q^26 - q^27 + q^28 - q^29 - q^30 + q^31 - q^32 + q^33 + q^34 - q^35 - q^36 - q^38 - q^39 + q^40 + O(q^41) (time = 0.471)

K = Q(sqrt(-47)):	q^-1 - 1 - q - q^3 - q^4 + q^5 + q^6 - q^7 + q^9 - q^10 + q^12 - q^13 - q^14 - q^15 + q^16 + q^17 + q^18 + q^19 - q^21 - q^22 - q^25 + q^26 - q^28 - q^29 + q^30 - q^33 - q^34 - q^35 - q^36 + q^37 + O(q^39) (time = 7.22)

K = Q(sqrt(-68)):	