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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.

A280577 a(n) = eulerphi(n) + floor(n/2).

Table of values

n a(n)
1 1
2 2
3 3
4 4
5 6
6 5
7 9
8 8
9 10
10 9
11 15
12 10
13 18
14 13
15 15
16 16
17 24
18 15
19 27
20 18
21 22
22 21
23 33
24 20
25 32
26 25
27 31
28 26
29 42
30 23
31 45
32 32
33 36
34 33
35 41
36 30
37 54
38 37
39 43
40 36
41 60
42 33
43 63
44 42
45 46
46 45
47 69
48 40
49 66
50 45
51 57
52 50
53 78
54 45
55 67
56 52
57 64
58 57
59 87
60 46
61 90
62 61
63 67
64 64
65 80
66 53
67 99
68 66
69 78

List of values

[1, 2, 3, 4, 6, 5, 9, 8, 10, 9, 15, 10, 18, 13, 15, 16, 24, 15, 27, 18, 22, 21, 33, 20, 32, 25, 31, 26, 42, 23, 45, 32, 36, 33, 41, 30, 54, 37, 43, 36, 60, 33, 63, 42, 46, 45, 69, 40, 66, 45, 57, 50, 78, 45, 67, 52, 64, 57, 87, 46, 90, 61, 67, 64, 80, 53, 99, 66, 78]

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

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