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.

A141115 Those positive integers k where both d(d(k)) is not coprime to k and d(d(k)) does not divide k, where d(k) is the number of divisors of k.

Table of values

n a(n)
1 18
2 30
3 42
4 50
5 54
6 66
7 70
8 78
9 98
10 102
11 110
12 114
13 130
14 138
15 140
16 154
17 160
18 162
19 170
20 174
21 182
22 186
23 190
24 200
25 220
26 222
27 224
28 230
29 238
30 242
31 246
32 250
33 258
34 260
35 266
36 282
37 286
38 290
39 308
40 310
41 315
42 318
43 322
44 338
45 340
46 350
47 352
48 354
49 364
50 366
51 370
52 374
53 380
54 392

List of values

[18, 30, 42, 50, 54, 66, 70, 78, 98, 102, 110, 114, 130, 138, 140, 154, 160, 162, 170, 174, 182, 186, 190, 200, 220, 222, 224, 230, 238, 242, 246, 250, 258, 260, 266, 282, 286, 290, 308, 310, 315, 318, 322, 338, 340, 350, 352, 354, 364, 366, 370, 374, 380, 392]

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

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