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.

A137257 A number k is included if there is at least one (nonzero) exponent in the prime factorization of k that is not coprime to k.

Table of values

n a(n)
1 4
2 12
3 16
4 18
5 20
6 24
7 27
8 28
9 36
10 44
11 48
12 50
13 52
14 54
15 60
16 64
17 68
18 72
19 76
20 80
21 84
22 90
23 92
24 98
25 100
26 108
27 112
28 116
29 120
30 124
31 126
32 132
33 135
34 140
35 144
36 148
37 150
38 156
39 160
40 162
41 164
42 168
43 172
44 176
45 180
46 188
47 189
48 192
49 196
50 198
51 200
52 204
53 208
54 212
55 216
56 220
57 228
58 234

List of values

[4, 12, 16, 18, 20, 24, 27, 28, 36, 44, 48, 50, 52, 54, 60, 64, 68, 72, 76, 80, 84, 90, 92, 98, 100, 108, 112, 116, 120, 124, 126, 132, 135, 140, 144, 148, 150, 156, 160, 162, 164, 168, 172, 176, 180, 188, 189, 192, 196, 198, 200, 204, 208, 212, 216, 220, 228, 234]

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

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