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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.

A140222 A number j is included if (Sum_{k=1..j} d(k)) is prime, where d(k) is the number of divisors of k.

Table of values

n a(n)
1 2
2 3
3 9
4 11
5 13
6 14
7 28
8 29
9 31
10 34
11 35
12 51
13 54
14 56
15 61
16 81
17 83
18 93
19 94
20 97
21 98
22 123
23 124
24 131
25 140
26 142
27 171
28 173
29 177
30 179
31 180
32 185
33 187
34 190
35 191
36 193
37 195
38 228
39 230
40 231
41 233
42 234
43 248
44 251
45 290
46 293
47 294
48 296
49 297
50 304
51 309
52 310
53 315
54 316
55 320
56 322
57 373

List of values

[2, 3, 9, 11, 13, 14, 28, 29, 31, 34, 35, 51, 54, 56, 61, 81, 83, 93, 94, 97, 98, 123, 124, 131, 140, 142, 171, 173, 177, 179, 180, 185, 187, 190, 191, 193, 195, 228, 230, 231, 233, 234, 248, 251, 290, 293, 294, 296, 297, 304, 309, 310, 315, 316, 320, 322, 373]

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

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