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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.

A369661 Numbers k whose arithmetic derivative k' is of the form 4m+2, and k' has an even number of prime factors.

Table of values

n a(n)
1 9
2 21
3 25
4 33
5 49
6 57
7 69
8 85
9 93
10 121
11 129
12 133
13 145
14 169
15 177
16 205
17 213
18 217
19 237
20 249
21 253
22 265
23 289
24 309
25 329
26 361
27 375
28 393
29 417
30 445
31 459
32 469
33 473
34 489
35 493
36 505
37 517
38 529
39 533
40 553
41 565
42 573
43 581
44 597
45 629
46 633
47 669
48 685
49 697
50 713
51 753
52 781
53 783
54 793
55 813
56 817
57 819
58 841
59 865
60 869
61 875
62 889
63 913
64 933
65 949
66 961

List of values

[9, 21, 25, 33, 49, 57, 69, 85, 93, 121, 129, 133, 145, 169, 177, 205, 213, 217, 237, 249, 253, 265, 289, 309, 329, 361, 375, 393, 417, 445, 459, 469, 473, 489, 493, 505, 517, 529, 533, 553, 565, 573, 581, 597, 629, 633, 669, 685, 697, 713, 753, 781, 783, 793, 813, 817, 819, 841, 865, 869, 875, 889, 913, 933, 949, 961]

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