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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.

A054085 a(n) = order of n in the permutation A054084 of the natural numbers if this order exists; a(n) = -1 otherwise.

Table of values

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

List of values

[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, -1]

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