A178505 - OEIS

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A178505 as a simple table

n	a(n)
1	3
2	142857
3	1
4	9
5	76923
6	588235294117647
7	52631578947368421
8	47619
9	434782608695652173913
10	37
11	344827586206896551724137931
12	32258064516129
13	3
14	27
15	25641
16	2439
17	23255813953488372093

[3,142857,1,9,76923,588235294117647, 52631578947368421,47619,434782608695652173913,37, 344827586206896551724137931,32258064516129,3,27, 25641,2439,23255813953488372093]

[3,142857,1,9,76923,588235294117647,
 52631578947368421,47619,434782608695652173913,37,
 344827586206896551724137931,32258064516129,3,27,
 25641,2439,23255813953488372093]