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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.

A121048 a(n) = n + phi(n), where phi is the Euler totient function.

Table of values

n a(n)
1 2
2 3
3 5
4 6
5 9
6 8
7 13
8 12
9 15
10 14
11 21
12 16
13 25
14 20
15 23
16 24
17 33
18 24
19 37
20 28
21 33
22 32
23 45
24 32
25 45
26 38
27 45
28 40
29 57
30 38
31 61
32 48
33 53
34 50
35 59
36 48
37 73
38 56
39 63
40 56
41 81
42 54
43 85
44 64
45 69
46 68
47 93
48 64
49 91
50 70
51 83
52 76
53 105
54 72
55 95
56 80
57 93
58 86
59 117
60 76
61 121
62 92
63 99
64 96
65 113
66 86
67 133
68 100
69 113

List of values

[2, 3, 5, 6, 9, 8, 13, 12, 15, 14, 21, 16, 25, 20, 23, 24, 33, 24, 37, 28, 33, 32, 45, 32, 45, 38, 45, 40, 57, 38, 61, 48, 53, 50, 59, 48, 73, 56, 63, 56, 81, 54, 85, 64, 69, 68, 93, 64, 91, 70, 83, 76, 105, 72, 95, 80, 93, 86, 117, 76, 121, 92, 99, 96, 113, 86, 133, 100, 113]

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

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