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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.

A292885 a(n) is the least number k such that k | concat(k-n,k-n+1,…,k,…,k+n-1,k+n).

Table of values

n a(n)
0 1
1 3
2 3
3 9
4 6
5 9
6 9
7 9
8 9
9 27
10 15
11 33
12 18
13 27
14 18
15 21
16 18
17 27
18 27
19 27
20 24
21 27
22 27
23 27
24 27
25 27
26 27
27 143
28 34
29 143
30 45
31 63
32 36
33 39
34 39
35 45
36 42
37 143
38 89
39 57
40 45
41 43
42 143
43 99
44 54
45 135
46 154
47 63
48 63
49 63
50 75
51 63
52 154
53 189
54 66
55 165
56 72
57 171
58 153
59 189
60 90
61 63
62 81
63 69
64 69

List of values

[1, 3, 3, 9, 6, 9, 9, 9, 9, 27, 15, 33, 18, 27, 18, 21, 18, 27, 27, 27, 24, 27, 27, 27, 27, 27, 27, 143, 34, 143, 45, 63, 36, 39, 39, 45, 42, 143, 89, 57, 45, 43, 143, 99, 54, 135, 154, 63, 63, 63, 75, 63, 154, 189, 66, 165, 72, 171, 153, 189, 90, 63, 81, 69, 69]

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

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