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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.

A380415 a(n) = phi(1 + phi(3 + phi(5 + ... + phi(2*n-1)))), where phi is Euler's totient function (A000010).

Table of values

n a(n)
1 1
2 2
3 6
4 12
5 18
6 22
7 42
8 42
9 72
10 20
11 48
12 18
13 12
14 108
15 20
16 42
17 20
18 42
19 20
20 36
21 42
22 42
23 36
24 36
25 36
26 42
27 20
28 42
29 42
30 36
31 36
32 42
33 20
34 48
35 48
36 18
37 36
38 36
39 36
40 36
41 48
42 48
43 20
44 48
45 48
46 36
47 20
48 48
49 96
50 20
51 96
52 36
53 20
54 20
55 42
56 36
57 36
58 20
59 36
60 36
61 36
62 20
63 20
64 36
65 36
66 20

List of values

[1, 2, 6, 12, 18, 22, 42, 42, 72, 20, 48, 18, 12, 108, 20, 42, 20, 42, 20, 36, 42, 42, 36, 36, 36, 42, 20, 42, 42, 36, 36, 42, 20, 48, 48, 18, 36, 36, 36, 36, 48, 48, 20, 48, 48, 36, 20, 48, 96, 20, 96, 36, 20, 20, 42, 36, 36, 20, 36, 36, 36, 20, 20, 36, 36, 20]

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

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