prime powers 4 <= q <= 3000000: 217169
tight cases (members of C5 or C8 with |Y~| > M): 291
  first ones: [(16, 'C8u', 4), (25, 'C5', 5), (49, 'C8u', 7), (64, 'C5', 8), (121, 'C5', 11), (169, 'C8u', 13), (256, 'C8u', 16), (289, 'C5', 17), (361, 'C8u', 19), (529, 'C5', 23), (625, 'C8u', 25), (841, 'C5', 29)]
  margins:  [(16, 'C8u', 2880), (25, 'C5', 348000), (49, 'C8u', 5400192), (64, 'C5', 290304), (121, 'C5', 209233200), (169, 'C8u', 800938320)]
failures: 0
time 1.2 s
