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.

A221865 The nonprimes k such that k + 2 is either a prime or a semiprime.

Table of values

n a(n)
1 0
2 1
3 4
4 8
5 9
6 12
7 15
8 20
9 21
10 24
11 27
12 32
13 33
14 35
15 36
16 39
17 44
18 45
19 49
20 51
21 55
22 56
23 57
24 60
25 63
26 65
27 69
28 72
29 75
30 77
31 80
32 81
33 84
34 85
35 87
36 91
37 92
38 93
39 95
40 99
41 104
42 105
43 111
44 116
45 117
46 119
47 120
48 121
49 125
50 129
51 132
52 135
53 140
54 141
55 143
56 144
57 147
58 153
59 155
60 156
61 159
62 161
63 164
64 165
65 171
66 175
67 176
68 177
69 183

List of values

[0, 1, 4, 8, 9, 12, 15, 20, 21, 24, 27, 32, 33, 35, 36, 39, 44, 45, 49, 51, 55, 56, 57, 60, 63, 65, 69, 72, 75, 77, 80, 81, 84, 85, 87, 91, 92, 93, 95, 99, 104, 105, 111, 116, 117, 119, 120, 121, 125, 129, 132, 135, 140, 141, 143, 144, 147, 153, 155, 156, 159, 161, 164, 165, 171, 175, 176, 177, 183]