A181431 - cp's OEIS frontend

A181431 For n not divisible by 10 and using as many leading zeros as needed, smallest number whose inverse has only digits of n in its period.

n	a(n)
1	9
2	45
3	3
4	225
5	18
6	15
7	142857
8	1125
9	11
10	909
11	825
12	76923
13	714285
14	66
15	61875
16	588235294117647
17	55
18	52631578947368421
19	47619
20	4545
21	434782608695652173913
22	4125
23	396
24	384615
25	37
26	3571425
27	344827586206896551724137931
28	32258064516129

[9, 45, 3, 225, 18, 15, 142857, 1125, 11, 909, 825, 76923, 714285, 66, 61875, 588235294117647, 55, 52631578947368421, 47619, 4545, 434782608695652173913, 4125, 396, 384615, 37, 3571425, 344827586206896551724137931, 32258064516129]

cp's OEIS Frontend

A181431 For n not divisible by 10 and using as many leading zeros as needed, smallest number whose inverse has only digits of n in its period.

Table of values

List of values