25 ≤ C(40,9,2) ≤ 26

Created by: A. West

Method of Construction: Local search - Bluskov PDO technique

Lower Bound: Horsley, Theorem 14a, r=5, d=1

  1  2  3  7 12 17 18 29 33
  1  4  9 17 19 20 24 30 40
  1  5  6 13 17 23 26 32 37
  1  8 14 16 17 21 25 27 36
  1 10 12 17 18 28 29 33 38
  1 11 15 17 22 31 34 35 39
  2  3  4  8 16 21 23 28 34
  2  3  5  6  9 15 27 28 32
  2  3  7 13 14 22 28 38 40
  2  7 19 24 25 28 31 36 39
  2 10 11 14 20 26 30 35 37
  3  7 11 20 26 28 30 35 37
  3 10 13 19 24 25 31 36 39
  4  5  6  7  8  9 10 22 27
  4  9 11 13 16 21 29 33 35
  4  9 12 14 18 23 31 32 39
  4  9 15 25 26 34 36 37 38
  5  6 11 12 18 25 35 36 40
  5  6 14 15 19 24 29 33 34
  5  6 16 20 21 30 31 38 39
  7 10 15 16 21 23 32 34 40
  8 11 19 23 24 27 32 35 38
  8 12 13 15 18 20 27 30 34
  8 26 27 29 31 33 37 39 40
 12 16 18 19 21 22 24 26 37
 20 22 23 25 29 30 32 33 36