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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.

A053158 Sum of n and its cototient function value (A051953): a(n) = 2*n - phi(n), where phi is Euler phi.

Table of values

n a(n)
1 1
2 3
3 4
4 6
5 6
6 10
7 8
8 12
9 12
10 16
11 12
12 20
13 14
14 22
15 22
16 24
17 18
18 30
19 20
20 32
21 30
22 34
23 24
24 40
25 30
26 40
27 36
28 44
29 30
30 52
31 32
32 48
33 46
34 52
35 46
36 60
37 38
38 58
39 54
40 64
41 42
42 72
43 44
44 68
45 66
46 70
47 48
48 80
49 56
50 80
51 70
52 80
53 54
54 90
55 70
56 88
57 78
58 88
59 60
60 104
61 62
62 94
63 90
64 96
65 82
66 112
67 68
68 104
69 94
70 116

List of values

[1, 3, 4, 6, 6, 10, 8, 12, 12, 16, 12, 20, 14, 22, 22, 24, 18, 30, 20, 32, 30, 34, 24, 40, 30, 40, 36, 44, 30, 52, 32, 48, 46, 52, 46, 60, 38, 58, 54, 64, 42, 72, 44, 68, 66, 70, 48, 80, 56, 80, 70, 80, 54, 90, 70, 88, 78, 88, 60, 104, 62, 94, 90, 96, 82, 112, 68, 104, 94, 116]

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

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