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.

A158340 Composite numbers k such that (number of prime factors of k, counted with multiplicity) + (number of divisors of k) is a prime.

Table of values

n a(n)
1 4
2 8
3 9
4 25
5 27
6 30
7 32
8 36
9 42
10 49
11 64
12 66
13 70
14 72
15 78
16 100
17 102
18 105
19 108
20 110
21 114
22 121
23 125
24 130
25 138
26 154
27 165
28 169
29 170
30 174
31 180
32 182
33 186
34 190
35 195
36 196
37 200
38 222
39 225
40 230
41 231
42 238
43 243
44 246
45 252
46 255
47 256
48 258
49 266
50 273
51 282
52 285
53 286
54 289
55 290
56 300

List of values

[4, 8, 9, 25, 27, 30, 32, 36, 42, 49, 64, 66, 70, 72, 78, 100, 102, 105, 108, 110, 114, 121, 125, 130, 138, 154, 165, 169, 170, 174, 180, 182, 186, 190, 195, 196, 200, 222, 225, 230, 231, 238, 243, 246, 252, 255, 256, 258, 266, 273, 282, 285, 286, 289, 290, 300]

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

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