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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.

A133234 a(n) is least semiprime (not already in list) such that no 3-term subset forms an arithmetic progression.

Table of values

n a(n)
1 4
2 6
3 9
4 10
5 15
6 22
7 25
8 33
9 39
10 49
11 55
12 58
13 82
14 86
15 87
16 93
17 111
18 118
19 121
20 122
21 134
22 145
23 185
24 194
25 201
26 202
27 206
28 215
29 237
30 247
31 274
32 287
33 298
34 299
35 303
36 305
37 314
38 334
39 335
40 358
41 362
42 386
43 446
44 447
45 454
46 471
47 482
48 497
49 502
50 527
51 529
52 537
53 553
54 554
55 562
56 614

List of values

[4, 6, 9, 10, 15, 22, 25, 33, 39, 49, 55, 58, 82, 86, 87, 93, 111, 118, 121, 122, 134, 145, 185, 194, 201, 202, 206, 215, 237, 247, 274, 287, 298, 299, 303, 305, 314, 334, 335, 358, 362, 386, 446, 447, 454, 471, 482, 497, 502, 527, 529, 537, 553, 554, 562, 614]

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

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