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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.

A264102 Numbers n with the property that the symmetric representation of sigma(n) has four parts, each of width one.

Table of values

n a(n)
1 21
2 27
3 33
4 39
5 51
6 55
7 57
8 65
9 69
10 85
11 87
12 93
13 95
14 111
15 115
16 119
17 123
18 125
19 129
20 133
21 141
22 145
23 155
24 159
25 161
26 177
27 183
28 185
29 201
30 203
31 205
32 213
33 215
34 217
35 219
36 230
37 235
38 237
39 249
40 250
41 253
42 259
43 265
44 267
45 287
46 290
47 291
48 295
49 301
50 303
51 305
52 309
53 310
54 319
55 321
56 327
57 329
58 335

List of values

[21, 27, 33, 39, 51, 55, 57, 65, 69, 85, 87, 93, 95, 111, 115, 119, 123, 125, 129, 133, 141, 145, 155, 159, 161, 177, 183, 185, 201, 203, 205, 213, 215, 217, 219, 230, 235, 237, 249, 250, 253, 259, 265, 267, 287, 290, 291, 295, 301, 303, 305, 309, 310, 319, 321, 327, 329, 335]

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

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