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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.

A284361 a(n) = Sum_{d|n, d = 0, 1, or 4 mod 5} d.

Table of values

n a(n)
1 1
2 1
3 1
4 5
5 6
6 7
7 1
8 5
9 10
10 16
11 12
12 11
13 1
14 15
15 21
16 21
17 1
18 16
19 20
20 40
21 22
22 12
23 1
24 35
25 31
26 27
27 10
28 19
29 30
30 67
31 32
32 21
33 12
34 35
35 41
36 56
37 1
38 20
39 40
40 80
41 42
42 42
43 1
44 60
45 75
46 47
47 1
48 51
49 50
50 91
51 52
52 31
53 1
54 70
55 72
56 75
57 20
58 30
59 60
60 151
61 62
62 32
63 31
64 85
65 71
66 84
67 1
68 39
69 70
70 135

List of values

[1, 1, 1, 5, 6, 7, 1, 5, 10, 16, 12, 11, 1, 15, 21, 21, 1, 16, 20, 40, 22, 12, 1, 35, 31, 27, 10, 19, 30, 67, 32, 21, 12, 35, 41, 56, 1, 20, 40, 80, 42, 42, 1, 60, 75, 47, 1, 51, 50, 91, 52, 31, 1, 70, 72, 75, 20, 30, 60, 151, 62, 32, 31, 85, 71, 84, 1, 39, 70, 135]

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

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