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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.

A333838 a(n) is the greatest integer q <= n such that for some r >= q, phi(q) + phi(r) = 2*n.

Table of values

n a(n)
1 1
2 0
3 3
4 4
5 5
6 6
7 7
8 8
9 9
10 10
11 11
12 12
13 12
14 14
15 15
16 16
17 17
18 18
19 19
20 20
21 21
22 21
23 23
24 24
25 25
26 26
27 27
28 28
29 29
30 30
31 31
32 32
33 33
34 34
35 35
36 36
37 34
38 38
39 39
40 40
41 41
42 42
43 43
44 43
45 45
46 46
47 47
48 48
49 49
50 50
51 51
52 52
53 53
54 53
55 55
56 56
57 57
58 58
59 59
60 60
61 60
62 61
63 62
64 64
65 65
66 66
67 64
68 68
69 68
70 70

List of values

[1, 0, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 12, 14, 15, 16, 17, 18, 19, 20, 21, 21, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 34, 38, 39, 40, 41, 42, 43, 43, 45, 46, 47, 48, 49, 50, 51, 52, 53, 53, 55, 56, 57, 58, 59, 60, 60, 61, 62, 64, 65, 66, 64, 68, 68, 70]

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

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