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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.

A033553 3-Knödel numbers or D-numbers: numbers m > 3 such that m | k^(m-2)-k for all k with gcd(k, m) = 1.

Table of values

n a(n)
1 9
2 15
3 21
4 33
5 39
6 51
7 57
8 63
9 69
10 87
11 93
12 111
13 123
14 129
15 141
16 159
17 177
18 183
19 195
20 201
21 213
22 219
23 237
24 249
25 267
26 291
27 303
28 309
29 315
30 321
31 327
32 339
33 381
34 393
35 399
36 411
37 417
38 447
39 453
40 471
41 489
42 501
43 519
44 537
45 543
46 573
47 579
48 591
49 597
50 633
51 669
52 681
53 687
54 693
55 699
56 717
57 723
58 753
59 771
60 789
61 807
62 813
63 819

List of values

[9, 15, 21, 33, 39, 51, 57, 63, 69, 87, 93, 111, 123, 129, 141, 159, 177, 183, 195, 201, 213, 219, 237, 249, 267, 291, 303, 309, 315, 321, 327, 339, 381, 393, 399, 411, 417, 447, 453, 471, 489, 501, 519, 537, 543, 573, 579, 591, 597, 633, 669, 681, 687, 693, 699, 717, 723, 753, 771, 789, 807, 813, 819]