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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.

A247081 Positive integers k such that the numerator of the harmonic mean of the nontrivial divisors of k is equal to k.

Table of values

n a(n)
1 8
2 15
3 18
4 21
5 33
6 35
7 39
8 45
9 51
10 55
11 57
12 63
13 65
14 69
15 77
16 81
17 85
18 87
19 91
20 93
21 95
22 99
23 111
24 115
25 117
26 119
27 123
28 128
29 129
30 133
31 141
32 143
33 145
34 147
35 153
36 155
37 159
38 161
39 162
40 171
41 175
42 177
43 183
44 185
45 187
46 201
47 203
48 205
49 207
50 209
51 213
52 215
53 217
54 219
55 221
56 235

List of values

[8, 15, 18, 21, 33, 35, 39, 45, 51, 55, 57, 63, 65, 69, 77, 81, 85, 87, 91, 93, 95, 99, 111, 115, 117, 119, 123, 128, 129, 133, 141, 143, 145, 147, 153, 155, 159, 161, 162, 171, 175, 177, 183, 185, 187, 201, 203, 205, 207, 209, 213, 215, 217, 219, 221, 235]

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

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