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.

A206449 Values of sigma(p) of primes p such that sigma(p) = sigma(c) has a solution for some composite number c.

Table of values

n a(n)
1 12
2 18
3 24
4 32
5 42
6 48
7 54
8 60
9 72
10 80
11 84
12 90
13 98
14 104
15 108
16 114
17 128
18 132
19 140
20 152
21 168
22 180
23 182
24 192
25 224
26 228
27 234
28 240
29 252
30 264
31 270
32 272
33 294
34 308
35 312
36 360
37 384
38 390
39 420
40 432
41 434
42 440
43 444
44 450
45 468
46 480
47 492
48 504
49 522
50 558
51 570
52 572
53 588
54 594
55 600

List of values

[12, 18, 24, 32, 42, 48, 54, 60, 72, 80, 84, 90, 98, 104, 108, 114, 128, 132, 140, 152, 168, 180, 182, 192, 224, 228, 234, 240, 252, 264, 270, 272, 294, 308, 312, 360, 384, 390, 420, 432, 434, 440, 444, 450, 468, 480, 492, 504, 522, 558, 570, 572, 588, 594, 600]

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

Content is available under The OEIS End-User License Agreement.