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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.

A308830 a(n) is the smallest positive integer such that the concatenation, in base 2, of the first n terms is divisible by n.

Table of values

n a(n)
1 1
2 2
3 3
4 4
5 5
6 2
7 9
8 8
9 5
10 2
11 3
12 20
13 7
14 14
15 27
16 16
17 11
18 30
19 11
20 20
21 15
22 22
23 31
24 24
25 11
26 14
27 11
28 20
29 15
30 10
31 35
32 32
33 1
34 26
35 97
36 92
37 53
38 18
39 31
40 56
41 91
42 10
43 3
44 12
45 27
46 30
47 15
48 48
49 37
50 78
51 23
52 108
53 9
54 6
55 49
56 8
57 51
58 54
59 87
60 60
61 79
62 26
63 25
64 64
65 111
66 122
67 117
68 28

List of values

[1, 2, 3, 4, 5, 2, 9, 8, 5, 2, 3, 20, 7, 14, 27, 16, 11, 30, 11, 20, 15, 22, 31, 24, 11, 14, 11, 20, 15, 10, 35, 32, 1, 26, 97, 92, 53, 18, 31, 56, 91, 10, 3, 12, 27, 30, 15, 48, 37, 78, 23, 108, 9, 6, 49, 8, 51, 54, 87, 60, 79, 26, 25, 64, 111, 122, 117, 28]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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