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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.

A364642 a(n) is the number of iterations of psi(phi(x)) starting at x = n and terminating when psi(phi(x)) = x (n is counted), -1 otherwise.

Table of values

n a(n)
1 1
2 2
3 1
4 2
5 3
6 2
7 4
8 3
9 4
10 3
11 5
12 3
13 5
14 4
15 4
16 4
17 5
18 4
19 6
20 4
21 5
22 5
23 6
24 4
25 6
26 5
27 6
28 5
29 6
30 4
31 7
32 5
33 6
34 5
35 6
36 5
37 7
38 6
39 6
40 5
41 7
42 5
43 7
44 6
45 6
46 6
47 7
48 5
49 7
50 6
51 6
52 6
53 7
54 6
55 7
56 6
57 7
58 6
59 7
60 5
61 8
62 7
63 7
64 6
65 7
66 6
67 8
68 6
69 7
70 6
71 8
72 6
73 8
74 7
75 7
76 7
77 8
78 6
79 8
80 6
81 8
82 7
83 8
84 6
85 7
86 7
87 7
88 7

List of values

[1, 2, 1, 2, 3, 2, 4, 3, 4, 3, 5, 3, 5, 4, 4, 4, 5, 4, 6, 4, 5, 5, 6, 4, 6, 5, 6, 5, 6, 4, 7, 5, 6, 5, 6, 5, 7, 6, 6, 5, 7, 5, 7, 6, 6, 6, 7, 5, 7, 6, 6, 6, 7, 6, 7, 6, 7, 6, 7, 5, 8, 7, 7, 6, 7, 6, 8, 6, 7, 6, 8, 6, 8, 7, 7, 7, 8, 6, 8, 6, 8, 7, 8, 6, 7, 7, 7, 7]

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

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