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.

A280382 Numbers k such that k-1 has the same number of prime factors counted with multiplicity as k+1.

Table of values

n a(n)
1 4
2 5
3 6
4 12
5 18
6 19
7 29
8 30
9 34
10 42
11 43
12 50
13 51
14 55
15 56
16 60
17 67
18 69
19 72
20 77
21 86
22 89
23 92
24 94
25 102
26 108
27 115
28 120
29 122
30 138
31 142
32 144
33 150
34 151
35 160
36 171
37 173
38 180
39 184
40 186
41 187
42 189
43 192
44 197
45 198
46 202
47 204
48 214
49 216
50 218
51 220
52 228
53 233
54 236
55 237
56 240
57 243
58 245
59 248
60 249
61 266
62 267
63 270
64 271
65 274
66 282

List of values

[4, 5, 6, 12, 18, 19, 29, 30, 34, 42, 43, 50, 51, 55, 56, 60, 67, 69, 72, 77, 86, 89, 92, 94, 102, 108, 115, 120, 122, 138, 142, 144, 150, 151, 160, 171, 173, 180, 184, 186, 187, 189, 192, 197, 198, 202, 204, 214, 216, 218, 220, 228, 233, 236, 237, 240, 243, 245, 248, 249, 266, 267, 270, 271, 274, 282]

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

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