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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.

A280107 Numbers m with the property that the symmetric representation of sigma(m) has four parts.

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 75
11 85
12 87
13 93
14 95
15 105
16 111
17 115
18 119
19 123
20 125
21 129
22 133
23 141
24 145
25 155
26 159
27 161
28 175
29 177
30 183
31 185
32 201
33 203
34 205
35 213
36 215
37 217
38 219
39 230
40 235
41 237
42 245
43 249
44 250
45 253
46 259
47 265
48 267
49 287
50 290
51 291
52 295
53 301
54 303
55 305
56 309
57 310
58 319
59 321
60 327
61 329

List of values

[21, 27, 33, 39, 51, 55, 57, 65, 69, 75, 85, 87, 93, 95, 105, 111, 115, 119, 123, 125, 129, 133, 141, 145, 155, 159, 161, 175, 177, 183, 185, 201, 203, 205, 213, 215, 217, 219, 230, 235, 237, 245, 249, 250, 253, 259, 265, 267, 287, 290, 291, 295, 301, 303, 305, 309, 310, 319, 321, 327, 329]

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

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