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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.

A218403 Bitwise OR of all proper divisors of n; a(1) = 0 by convention.

Table of values

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

List of values

[0, 1, 1, 3, 1, 3, 1, 7, 3, 7, 1, 7, 1, 7, 7, 15, 1, 15, 1, 15, 7, 11, 1, 15, 5, 15, 11, 15, 1, 15, 1, 31, 11, 19, 7, 31, 1, 19, 15, 31, 1, 31, 1, 31, 15, 23, 1, 31, 7, 31, 19, 31, 1, 31, 15, 31, 19, 31, 1, 31, 1, 31, 31, 63, 13, 63, 1, 55, 23, 47, 1, 63, 1]

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

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