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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.

A216240 Composite numbers arising in Eratosthenes sieve with removing the multiples of every other remaining numbers after 2 (see comment).

Table of values

n a(n)
1 9
2 21
3 33
4 49
5 51
6 77
7 87
8 119
9 121
10 123
11 141
12 177
13 187
14 201
15 203
16 219
17 237
18 287
19 289
20 291
21 309
22 319
23 327
24 329
25 357
26 393
27 413
28 417
29 447
30 451
31 469
32 471
33 493
34 501
35 511
36 517
37 543
38 553
39 573
40 591
41 633
42 649
43 669
44 679
45 687
46 697
47 721
48 723
49 737
50 763
51 771
52 799
53 803
54 807

List of values

[9, 21, 33, 49, 51, 77, 87, 119, 121, 123, 141, 177, 187, 201, 203, 219, 237, 287, 289, 291, 309, 319, 327, 329, 357, 393, 413, 417, 447, 451, 469, 471, 493, 501, 511, 517, 543, 553, 573, 591, 633, 649, 669, 679, 687, 697, 721, 723, 737, 763, 771, 799, 803, 807]

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

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