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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.

A374735 a(n) is the least k > 0 such that n and k*n can be added without carries in decimal.

Table of values

n a(n)
0 1
1 1
2 1
3 1
4 1
5 2
6 2
7 3
8 5
9 10
10 1
11 1
12 1
13 1
14 1
15 2
16 2
17 3
18 10
19 20
20 1
21 1
22 1
23 1
24 1
25 2
26 2
27 6
28 5
29 30
30 1
31 1
32 1
33 1
34 1
35 4
36 7
37 3
38 20
39 40
40 1
41 1
42 1
43 1
44 1
45 10
46 5
47 3
48 5
49 50
50 2
51 2
52 2
53 2
54 6
55 2
56 2
57 6
58 30
59 60
60 2
61 2
62 2
63 2
64 5
65 2
66 2
67 3
68 15
69 70
70 3
71 3
72 3
73 7
74 3
75 4
76 12
77 13
78 40
79 80
80 5
81 5

List of values

[1, 1, 1, 1, 1, 2, 2, 3, 5, 10, 1, 1, 1, 1, 1, 2, 2, 3, 10, 20, 1, 1, 1, 1, 1, 2, 2, 6, 5, 30, 1, 1, 1, 1, 1, 4, 7, 3, 20, 40, 1, 1, 1, 1, 1, 10, 5, 3, 5, 50, 2, 2, 2, 2, 6, 2, 2, 6, 30, 60, 2, 2, 2, 2, 5, 2, 2, 3, 15, 70, 3, 3, 3, 7, 3, 4, 12, 13, 40, 80, 5, 5]

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