# Data

## Chromatic Numbers of Small Graphs

• Chromatic numbers of simple graphs on 7 or fewer vertices.
•   $n = 1$ 2 3 4 5 6 7
$\chi = 1$ 0 0 0 0 0 0 0
2 1 1 3 5 17 44 182
3 0 1 2 12 64 475 5036
4 0 0 1 3 26 282 5009
5 0 0 0 1 4 46 809
6 0 0 0 0 1 5 74
7 0 0 0 0 0 1 6
8 0 0 0 0 0 0 1
Total: 1 2 6 21 112 853 11117
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• Chromatic numbers of $k$-regular simple graphs on 10 or fewer vertices.
•   $\chi = 1$ 2 3 4 5 6 7 8 9
$k = 1$ 0 0 0 0 0 0 0 0 0
2 5 6 4 2 1 0 0 0 0
3 0 13 22 42 6 2 0 0 0
4 0 0 4 40 53 11 1 0 0
5 0 0 0 2 3 13 3 1 0
6 0 0 0 0 1 0 1 0 0
7 0 0 0 0 0 1 0 0 0
8 0 0 0 0 0 0 1 0 0
9 0 0 0 0 0 0 0 1 0
10 0 0 0 0 0 0 0 0 1
Total: 5 19 30 86 64 27 6 2 1
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• Chromatic numbers of connected $k$-regular simple graphs on 10 or fewer vertices.
•   $\chi = 1$ 2 3 4 5 6 7 8 9
$k = 1$ 0 0 0 0 0 0 0 0 0
2 1 4 4 2 1 0 0 0 0
3 0 4 22 42 6 2 0 0 0
4 0 0 1 40 53 11 1 0 0
5 0 0 0 1 3 13 3 1 0
6 0 0 0 0 1 0 1 0 0
7 0 0 0 0 0 1 0 0 0
8 0 0 0 0 0 0 1 0 0
9 0 0 0 0 0 0 0 1 0
10 0 0 0 0 0 0 0 0 1
Total: 1 8 27 85 64 27 6 2 1
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## Chromatic Indices of Small Graphs

• Chromatic numbers of connected simple graphs of order 9 or less and size 10 or less.
•   $n = 2$ 3 4 5 6 7 8 9
$\chi = 2$ 0 1 2 1 2 1 2 1
3 0 1 4 8 26 58 162 254
4 0 0 0 10 45 193 435 538
5 0 0 0 2 21 80 187 215
6 0 0 0 0 0 18 39 59
7 0 0 0 0 0 0 9 13
8 0 0 0 0 0 0 0 4
9 0 0 0 0 0 0 0 0
Total: 0 2 6 21 94 350 834 1084
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• Chromatic numbers of simple graphs of order 9 or less and size 10 or less.
•   $n = 2$ 3 4 5 6 7 8 9
$\chi = 2$ 0 1 3 5 10 15 26 37
3 0 1 5 14 46 123 350 772
4 0 0 0 10 55 258 749 1476
5 0 0 0 2 23 104 305 568
6 0 0 0 0 0 18 57 125
7 0 0 0 0 0 0 9 22
8 0 0 0 0 0 0 0 4
9 0 0 0 0 0 0 0 0
Total: 0 2 8 31 134 518 1496 3004
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