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.

A340269 Numbers k > 1 such that lpf(k)-1 does not divide d-1 for at least one divisor d of k, where lpf(k) is the least prime factor of k (A020639).

Table of values

n a(n)
1 35
2 55
3 77
4 95
5 115
6 119
7 143
8 155
9 161
10 175
11 187
12 203
13 209
14 215
15 221
16 235
17 245
18 247
19 253
20 275
21 287
22 295
23 299
24 319
25 323
26 329
27 335
28 355
29 371
30 377
31 385
32 391
33 395
34 403
35 407
36 413
37 415
38 437
39 455
40 473
41 475
42 493
43 497
44 515
45 517
46 527
47 533
48 535
49 539
50 551
51 559
52 575
53 581

List of values

[35, 55, 77, 95, 115, 119, 143, 155, 161, 175, 187, 203, 209, 215, 221, 235, 245, 247, 253, 275, 287, 295, 299, 319, 323, 329, 335, 355, 371, 377, 385, 391, 395, 403, 407, 413, 415, 437, 455, 473, 475, 493, 497, 515, 517, 527, 533, 535, 539, 551, 559, 575, 581]

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

Content is available under The OEIS End-User License Agreement.