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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.

A055653 Sum of phi(d) [A000010] over all unitary divisors d of n (that is, gcd(d,n/d) = 1).

Table of values

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

List of values

[1, 2, 3, 3, 5, 6, 7, 5, 7, 10, 11, 9, 13, 14, 15, 9, 17, 14, 19, 15, 21, 22, 23, 15, 21, 26, 19, 21, 29, 30, 31, 17, 33, 34, 35, 21, 37, 38, 39, 25, 41, 42, 43, 33, 35, 46, 47, 27, 43, 42, 51, 39, 53, 38, 55, 35, 57, 58, 59, 45, 61, 62, 49, 33, 65, 66, 67, 51, 69, 70, 71, 35, 73]

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