10 ≤ C(31,21,4) ≤ 12

Created by: Kinski & Genivaldo Pereira

Lower Bound: Theorem 4, Todorov, JCTA 1985

  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20 21
  1  2  3  4  5  6  7  8  9 12 13 14 15 16 17 18 19 20 22 23 24
  1  2  3  4  5  6  7  8  9 12 13 14 15 16 17 18 19 20 25 26 27
  1  2  3  4  5  6  7  8  9 12 13 14 15 16 17 18 19 20 28 29 30
  1  2  3  4  5  6  7  8  9 12 13 14 15 16 17 18 19 20 28 29 31
  1  2  7  9 10 11 12 13 16 20 21 22 23 24 25 26 27 28 29 30 31
  1  3  4  5  8 10 11 12 13 19 21 22 23 24 25 26 27 28 29 30 31
  1  6 10 11 12 13 14 15 17 18 21 22 23 24 25 26 27 28 29 30 31
  2  3  4  6  7 10 11 15 18 19 21 22 23 24 25 26 27 28 29 30 31
  2  3  5  7  8 10 11 14 17 18 21 22 23 24 25 26 27 28 29 30 31
  3  5  6  8  9 10 11 15 16 20 21 22 23 24 25 26 27 28 29 30 31
  4  9 10 11 14 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31