cp's OEIS Frontend

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.

A333569 a(n) = Sum_{d|n} (-1)^(bigomega(d) - omega(d)) * phi(n/d).

Table of values

n a(n)
1 1
2 2
3 3
4 2
5 5
6 6
7 7
8 6
9 7
10 10
11 11
12 6
13 13
14 14
15 15
16 10
17 17
18 14
19 19
20 10
21 21
22 22
23 23
24 18
25 23
26 26
27 23
28 14
29 29
30 30
31 31
32 22
33 33
34 34
35 35
36 14
37 37
38 38
39 39
40 30
41 41
42 42
43 43
44 22
45 35
46 46
47 47
48 30
49 47
50 46
51 51
52 26
53 53
54 46
55 55
56 42
57 57
58 58
59 59
60 30
61 61
62 62
63 49
64 42
65 65
66 66
67 67
68 34
69 69
70 70
71 71
72 42
73 73
74 74
75 69

List of values

[1, 2, 3, 2, 5, 6, 7, 6, 7, 10, 11, 6, 13, 14, 15, 10, 17, 14, 19, 10, 21, 22, 23, 18, 23, 26, 23, 14, 29, 30, 31, 22, 33, 34, 35, 14, 37, 38, 39, 30, 41, 42, 43, 22, 35, 46, 47, 30, 47, 46, 51, 26, 53, 46, 55, 42, 57, 58, 59, 30, 61, 62, 49, 42, 65, 66, 67, 34, 69, 70, 71, 42, 73, 74, 69]