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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.

A178908 GF(2) sum of divisors of n.

Table of values

n a(n)
1 1
2 3
3 2
4 7
5 7
6 6
7 6
8 15
9 12
10 9
11 10
12 14
13 12
14 10
15 8
16 31
17 25
18 20
19 18
20 21
21 19
22 30
23 24
24 30
25 24
26 20
27 18
28 18
29 20
30 24
31 30
32 63
33 60
34 43
35 40
36 36
37 36
38 54
39 54
40 45
41 40
42 53
43 48
44 54
45 48
46 40
47 46
48 62
49 60
50 40
51 42
52 36
53 36
54 54
55 54
56 34
57 36
58 60
59 58
60 56
61 60
62 34
63 38
64 127
65 121
66 68
67 66
68 79
69 79
70 120
71 120

List of values

[1, 3, 2, 7, 7, 6, 6, 15, 12, 9, 10, 14, 12, 10, 8, 31, 25, 20, 18, 21, 19, 30, 24, 30, 24, 20, 18, 18, 20, 24, 30, 63, 60, 43, 40, 36, 36, 54, 54, 45, 40, 53, 48, 54, 48, 40, 46, 62, 60, 40, 42, 36, 36, 54, 54, 34, 36, 60, 58, 56, 60, 34, 38, 127, 121, 68, 66, 79, 79, 120, 120]

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

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