cp's OEIS Frontend

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.

A143791 A positive integer k is included if no prime divisor p of k, when p is represented in binary, occurs within k represented in binary.

Table of values

n a(n)
1 1
2 9
3 21
4 25
5 33
6 35
7 49
8 65
9 69
10 77
11 81
12 115
13 121
14 129
15 133
16 143
17 145
18 161
19 169
20 203
21 209
22 217
23 253
24 259
25 261
26 265
27 273
28 275
29 289
30 295
31 297
32 299
33 301
34 305
35 319
36 321
37 323
38 329
39 341
40 361
41 377
42 385
43 391
44 403
45 415
46 427
47 437
48 451
49 481
50 505
51 513
52 515
53 517
54 527
55 529

List of values

[1, 9, 21, 25, 33, 35, 49, 65, 69, 77, 81, 115, 121, 129, 133, 143, 145, 161, 169, 203, 209, 217, 253, 259, 261, 265, 273, 275, 289, 295, 297, 299, 301, 305, 319, 321, 323, 329, 341, 361, 377, 385, 391, 403, 415, 427, 437, 451, 481, 505, 513, 515, 517, 527, 529]

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

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