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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.

A054083 a(n) = order of n in the permutation A054082 of the natural numbers if this order exists; a(n) = -1 otherwise.

Table of values

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

List of values

[2, 2, 2, 2, 7, 7, 7, 7, 7, 7, 9, 7, 9, 9, 9, 9, 9, 9, -1, 9, -1, 9, -1, -1, -1, -1, 16, -1, 16, -1, 16, -1, -1, 16, 16, 16, 16, 16, -1, -1, 16, 16, -1, 16, -1, 16, -1, -1, 16, -1, -1, 16, -1, 16, -1, -1, -1, -1, -1, -1, -1, -1, -1, 16, -1, -1, -1, -1, -1, -1]

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