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Base 38 has Riesel = 13
Covering set {3. 5. 17}

k n
1 1
2 2
3 1
4 1
5 2
6 1
7 7
8 2
9 43
10 1
11 766
12 2
13 Riesel

Listed by decreasing n:
k n
11 766
9 43
7 7
5 2
2 2
12 2
8 2
3 1
1 1
6 1
10 1
4 1