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.

A153357 Numbers n such that the harmonic number numerator A001008(n) is a semiprime.

Table of values

n a(n)
1 4
2 6
3 11
4 14
5 15
6 17
7 19
8 20
9 23
10 25
11 31
12 33
13 34
14 35
15 37
16 39
17 49
18 53
19 55
20 59
21 61
22 68
23 90
24 93
25 94
26 101
27 116
28 117
29 121
30 124
31 145
32 155
33 158
34 163
35 169
36 170
37 186
38 193
39 194
40 199
41 205
42 211
43 214
44 245
45 258
46 259
47 264
48 267
49 283
50 311
51 315
52 328
53 340
54 347
55 359
56 365
57 371
58 385

List of values

[4, 6, 11, 14, 15, 17, 19, 20, 23, 25, 31, 33, 34, 35, 37, 39, 49, 53, 55, 59, 61, 68, 90, 93, 94, 101, 116, 117, 121, 124, 145, 155, 158, 163, 169, 170, 186, 193, 194, 199, 205, 211, 214, 245, 258, 259, 264, 267, 283, 311, 315, 328, 340, 347, 359, 365, 371, 385]