lower bound = 32

32 ≤ CC(13,5,3) ≤ 34

Method of Construction: nurmela-ostergard simulated annealing covering design

Lower Bound: Schonheim

  1  3  5  7  9
  2  4  7  8  9
  1  2  4  5 10
  3  6  7  8 10
  4  5  6  9 10
  1  2  7  9 10
  2  5  6  7 11
  1  3  4  8 11
  3  4  6  9 11
  1  6  8  9 11
  3  4  5 10 11
  1  2  8 10 11
  1  4  6  7 12
  2  3  5  8 12
  2  3  6  9 12
  5  7  8  9 12
  1  2  3 10 12
  4  5  8 10 12
  2  3  4 11 12
  1  5  8 11 12
  7  9 10 11 12
  1  3  5  6 13
  2  4  6  8 13
  1  2  6 10 13
  4  5  7 10 13
  6  7  9 10 13
  3  8  9 10 13
  3  4  7 11 13
  1  7  8 11 13
  2  5  9 11 13
  2  3  7 12 13
  5  6  8 12 13
  1  4  9 12 13
  6 10 11 12 13