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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.

A357986 a(n) is the unique k such that A357579(k) = A007916(n), or -1 if no such k exists.

Table of values

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

List of values

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

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

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