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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.

A291914 Termination behavior of the iteration k->(sigma(k)+phi(k))/2 when started at k=n.

Table of values

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

List of values

[0, -1, -1, 0, -1, -2, -1, 0, 0, -2, -1, 2, -1, 3, 2, 0, -1, 0, -1, 2, -3, -2, -1, 4, 0, -3, -2, 4, -1, -3, -1, 0, 4, 3, 2, 0, -1, -4, -3, -2, -1, 9, -1, -3, -4, -2, -1, 7, 0, 0, -3, -2, -1, 8, 3, 2, -3, -2, -1, -4, -1, 8, 7, 0, -4, -3, -1, -2]