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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.

A069208 a(n) = Sum_{ d divides n } phi(n)/phi(d).

Table of values

n a(n)
1 1
2 2
3 3
4 5
5 5
6 6
7 7
8 11
9 10
10 10
11 11
12 15
13 13
14 14
15 15
16 23
17 17
18 20
19 19
20 25
21 21
22 22
23 23
24 33
25 26
26 26
27 31
28 35
29 29
30 30
31 31
32 47
33 33
34 34
35 35
36 50
37 37
38 38
39 39
40 55
41 41
42 42
43 43
44 55
45 50
46 46
47 47
48 69
49 50
50 52
51 51
52 65
53 53
54 62
55 55
56 77
57 57
58 58
59 59
60 75
61 61
62 62
63 70
64 95
65 65
66 66
67 67
68 85
69 69
70 70
71 71

List of values

[1, 2, 3, 5, 5, 6, 7, 11, 10, 10, 11, 15, 13, 14, 15, 23, 17, 20, 19, 25, 21, 22, 23, 33, 26, 26, 31, 35, 29, 30, 31, 47, 33, 34, 35, 50, 37, 38, 39, 55, 41, 42, 43, 55, 50, 46, 47, 69, 50, 52, 51, 65, 53, 62, 55, 77, 57, 58, 59, 75, 61, 62, 70, 95, 65, 66, 67, 85, 69, 70, 71]

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

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