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.

A367632 Numbers k with at least one pair of adjacent divisors i,j of k with i < j such that i' > j'. Here, n' denotes the arithmetic derivative of n.

Table of values

n a(n)
1 20
2 28
3 40
4 42
5 44
6 52
7 56
8 60
9 66
10 68
11 72
12 76
13 78
14 80
15 84
16 88
17 92
18 99
19 100
20 102
21 104
22 110
23 112
24 114
25 116
26 117
27 120
28 124
29 126
30 130
31 132
32 136
33 138
34 140
35 144
36 148
37 152
38 153
39 156
40 160
41 164
42 168
43 170
44 171
45 172
46 174
47 176
48 180
49 184
50 186
51 188
52 190
53 196
54 198
55 200
56 204

List of values

[20, 28, 40, 42, 44, 52, 56, 60, 66, 68, 72, 76, 78, 80, 84, 88, 92, 99, 100, 102, 104, 110, 112, 114, 116, 117, 120, 124, 126, 130, 132, 136, 138, 140, 144, 148, 152, 153, 156, 160, 164, 168, 170, 171, 172, 174, 176, 180, 184, 186, 188, 190, 196, 198, 200, 204]

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

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