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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.

A337920 Numbers k such that d(k) = d(k+1), where d(k) = A058312(k) is the denominator of the k-th alternating harmonic number.

Table of values

n a(n)
1 5
2 9
3 11
4 13
5 17
6 20
7 21
8 23
9 25
10 29
11 32
12 33
13 35
14 37
15 38
16 39
17 41
18 43
19 44
20 45
21 47
22 49
23 50
24 51
25 53
26 54
27 55
28 56
29 57
30 59
31 61
32 62
33 64
34 65
35 67
36 68
37 69
38 71
39 73
40 75
41 77
42 79
43 81
44 83
45 84
46 85
47 86
48 89
49 90
50 91
51 92
52 93
53 94
54 95
55 97
56 98
57 101
58 104
59 105
60 107
61 109
62 110
63 111
64 113

List of values

[5, 9, 11, 13, 17, 20, 21, 23, 25, 29, 32, 33, 35, 37, 38, 39, 41, 43, 44, 45, 47, 49, 50, 51, 53, 54, 55, 56, 57, 59, 61, 62, 64, 65, 67, 68, 69, 71, 73, 75, 77, 79, 81, 83, 84, 85, 86, 89, 90, 91, 92, 93, 94, 95, 97, 98, 101, 104, 105, 107, 109, 110, 111, 113]

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

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