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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.

A178610 n-th semiprime minus difference between the prime indices of the two factors of n-th semiprime.

Table of values

n a(n)
1 4
2 5
3 9
4 8
5 11
6 14
7 19
8 18
9 25
10 21
11 30
12 28
13 34
14 31
15 35
16 38
17 49
18 46
19 53
20 51
21 49
22 52
23 62
24 62
25 63
26 76
27 70
28 81
29 73
30 79
31 89
32 84
33 80
34 90
35 91
36 101
37 109
38 102
39 116
40 121
41 105
42 112
43 117
44 129
45 116
46 128
47 123
48 142
49 138
50 126
51 147
52 137
53 145
54 156
55 144
56 169
57 162
58 155
59 167
60 176
61 185
62 170

List of values

[4, 5, 9, 8, 11, 14, 19, 18, 25, 21, 30, 28, 34, 31, 35, 38, 49, 46, 53, 51, 49, 52, 62, 62, 63, 76, 70, 81, 73, 79, 89, 84, 80, 90, 91, 101, 109, 102, 116, 121, 105, 112, 117, 129, 116, 128, 123, 142, 138, 126, 147, 137, 145, 156, 144, 169, 162, 155, 167, 176, 185, 170]

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

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