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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A317173 a(n) is the least k > 0 such that k * n contains a digit 1 in its decimal representation.

Table of values

n a(n)
1 1
2 5
3 4
4 3
5 2
6 2
7 2
8 2
9 2
10 1
11 1
12 1
13 1
14 1
15 1
16 1
17 1
18 1
19 1
20 5
21 1
22 5
23 5
24 5
25 4
26 4
27 3
28 4
29 4
30 4
31 1
32 4
33 4
34 3
35 3
36 3
37 3
38 3
39 3
40 3
41 1
42 3
43 3
44 3
45 3
46 3
47 3
48 3
49 3
50 2
51 1
52 2
53 2
54 2
55 2
56 2
57 2
58 2
59 2
60 2
61 1
62 2
63 2
64 2
65 2
66 2
67 2
68 2
69 2
70 2
71 1
72 2
73 2
74 2
75 2
76 2
77 2
78 2
79 2
80 2
81 1
82 2
83 2
84 2
85 2
86 2
87 2

List of values

[1, 5, 4, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 5, 1, 5, 5, 5, 4, 4, 3, 4, 4, 4, 1, 4, 4, 3, 3, 3, 3, 3, 3, 3, 1, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2]

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