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.

A029827 Composite connected numbers: composite numbers k such that g(k) < g(u) + g(v) holds for all relatively prime factorizations k=u*v, where g(x) = ceiling(log_2 x).

Table of values

n a(n)
1 15
2 45
3 51
4 55
5 57
6 63
7 85
8 95
9 99
10 111
11 115
12 117
13 119
14 123
15 153
16 171
17 185
18 187
19 201
20 205
21 207
22 209
23 213
24 215
25 219
26 221
27 225
28 231
29 235
30 237
31 245
32 247
33 249
34 253
35 255
36 323
37 333
38 335
39 355
40 365
41 369
42 387
43 391
44 393
45 395
46 405
47 407
48 411
49 415
50 417
51 423
52 425
53 429

List of values

[15, 45, 51, 55, 57, 63, 85, 95, 99, 111, 115, 117, 119, 123, 153, 171, 185, 187, 201, 205, 207, 209, 213, 215, 219, 221, 225, 231, 235, 237, 245, 247, 249, 253, 255, 323, 333, 335, 355, 365, 369, 387, 391, 393, 395, 405, 407, 411, 415, 417, 423, 425, 429]

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

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