checked hard class n = 1 mod 4, n <= 250000
misses: 0
max offset used: 14
c histogram:
  c=3: 59867
  c=7: 2265
  c=11: 241
  c=15: 42
  c=19: 37
  c=23: 32
  c=27: 2
  c=31: 11
  c=39: 1
  c=59: 1